- Coulomb's law describes the electric force between two point charges. It states that the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
- The document discusses various methods of charging objects, including rubbing, conduction, and induction. It also describes the properties of conductors and insulators.
- Examples are provided to demonstrate how to use Coulomb's law to calculate the electric force between charges, including resolving forces into components. Equilibrium situations involving electric forces and other forces are also analyzed.
This is first PPT in the electrostatics series. This PPT presents idea of charge , its various methods of production like through conduction, friction, induction. It also describes working of electroscope & concept of grounding of an insulator.
This is first PPT in the electrostatics series. This PPT presents idea of charge , its various methods of production like through conduction, friction, induction. It also describes working of electroscope & concept of grounding of an insulator.
Electric Charge and Electric Field LectureFroyd Wess
More: http://www.pinoybix.org
Lesson Objectives:
Static Electricity; Electric Charge and Its Conservation
Electric Charge in the Atom
Insulators and Conductors
Induced Charge; the Electroscope
Coulomb’s Law
Solving Problems Involving Coulomb’s Law and Vectors
The Electric Field
Field Lines
Electric Fields and Conductors
Gauss’s Law
Electric Forces in Molecular Biology: DNA Structure and Replication
Photocopy Machines and Computer Printers Use Electrostatics
Malaysia SPM syllabus Physics Chapter 7 Part 4: Electromotive force and internal resistance
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Contact us for your presentation design needs: lesson / teaching, wedding, seminar, workshop, client pitch etc.
As electric field, that is, force per unit charge is a vector quantity; it can be used to represent overall effect of electric field in system of electric charges. Similarly electric field can be used in pictorial form to describe the overall intensity of the field. Copy the link given below and paste it in new browser window to get more information on Electric Field Lines www.askiitians.com/iit-jee-electrostatics/electric-field-lines/
The force felt by a unit positive charge or test charge when it's kept near a charge is called Electric Field. The electric field is also defined as the region which attracts or repels a charge. The electric field is a vector quantity and it denoted by E. Copy the link given below and paste it in new browser window to get more information on Electric Field www.askiitians.com/iit-jee-electrostatics/electric-field/
Electric Charge and Electric Field LectureFroyd Wess
More: http://www.pinoybix.org
Lesson Objectives:
Static Electricity; Electric Charge and Its Conservation
Electric Charge in the Atom
Insulators and Conductors
Induced Charge; the Electroscope
Coulomb’s Law
Solving Problems Involving Coulomb’s Law and Vectors
The Electric Field
Field Lines
Electric Fields and Conductors
Gauss’s Law
Electric Forces in Molecular Biology: DNA Structure and Replication
Photocopy Machines and Computer Printers Use Electrostatics
Malaysia SPM syllabus Physics Chapter 7 Part 4: Electromotive force and internal resistance
Also available for hire!
Contact us for your presentation design needs: lesson / teaching, wedding, seminar, workshop, client pitch etc.
As electric field, that is, force per unit charge is a vector quantity; it can be used to represent overall effect of electric field in system of electric charges. Similarly electric field can be used in pictorial form to describe the overall intensity of the field. Copy the link given below and paste it in new browser window to get more information on Electric Field Lines www.askiitians.com/iit-jee-electrostatics/electric-field-lines/
The force felt by a unit positive charge or test charge when it's kept near a charge is called Electric Field. The electric field is also defined as the region which attracts or repels a charge. The electric field is a vector quantity and it denoted by E. Copy the link given below and paste it in new browser window to get more information on Electric Field www.askiitians.com/iit-jee-electrostatics/electric-field/
Learning Objectives
Define electric charge, and describe how the two types of charge interact.
Desribe three common situations that generate static electricity. State the law of conservation of charge.
Describe three methods for charging an object.
State Coulomb’s law
Describe an electric field diagram of a positive point charge; of a negative point charge with twice the magnitude of positive charge
Draw the electric field lines between two points of the same charge; between two points of opposite charge.
Thank you So much
The following presentation explain about electric charge ,its properties and methods of charging a body .the presentation also explain electrostatic force
Since classical physics, it has been known that some materials, such as amber, attract lightweight particles after rubbing. The Greek word for amber, ήλεκτρον, or electron, was the source of the word 'electricity'. Electrostatic phenomena arise from the forces that electric charges exert on each other. Such forces are described by Coulomb's law. Even though electrostatically induced forces seem to be rather weak, some electrostatic forces such as the one between an electron and a proton, that together make up a hydrogen atom, is about 36 orders of magnitude stronger than the gravitational force acting between them.
There are many examples of electrostatic phenomena, from those as simple as the attraction of the plastic wrap to one's hand after it is removed from a package to the apparently spontaneous explosion of grain silos, the damage of electronic components during manufacturing, and photocopier & laser printer operation. Electrostatics involves the buildup of charge on the surface of objects due to contact with other surfaces. Although charge exchange happens whenever any two surfaces contact and separate, the effects of charge exchange are usually only noticed when at least one of the surfaces has a high resistance to electrical flow. This is because the charges that transfer are trapped there for a time long enough for their effects to be observed. These charges then remain on the object until they either bleed off to ground or are quickly neutralized by a discharge: e.g., the familiar phenomenon of a static "shock" is caused by the neutralization of charge built up in the body from contact with insulated surfaces.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
2. ELECTRIC CHARGES &
ELECTRIC FIELDS
*Properties of electric charges
*Coulomb’s law
*Electric field
*Electric field of continuous charge
distribution
*Electric field lines
*Motion of charged particles in a
uniform electric field
3. Learning Outcomes
• On the completion of this chapter students
should be able to:
• Draw, explain, write the strength and
determine the electric field around a
charged particle and a configuration of
charged particle and the electric forces
experienced by or exerted upon any
charged particle or any configuration of
charged particles.
4. Static Electricity; Electric Charge and Its
Conservation
Objects can be charged by rubbing – posses net
electric charge
Ex – combing your hair , touched a metal
doorknob after sliding the carpet
(a) Rub a plastic ruler and (b) bring it close to some tiny pieces of paper.
5. Static Electricity;
Electric Charge and Its
Conservation
• Benjamin Franklin(1706-
1790)
• Positive charge – possessed
by protons
• Negative charge –
possessed by electrons
• Charges of same sign repel
• Charges of opposite signs
attract
6. (a)A negatively charged rubber rod suspended by a thread is
attracted to a positively charged glass rod.
(b) A negatively charged rubber rod is repelled by another
negatively charged rubber rod.
7. Electric Charge in the Atom
Atom:
Nucleus
(small, massive, positiv
e charge)
Electron cloud
(large, very low
density, negative
charge)
8. Electric Charge in the Atom
Atom is electrically neutral.
Rubbing charges objects by moving electrons
from one to the other.
9. Electric Charge in the Atom
Polar molecule: neutral overall, but charge not
evenly distributed
Diagram of a water molecule. Because it has opposite charges on different
ends, it is called a “polar” molecule.
10. Conductor:
Charge flows freely
Metals
Insulator:
Almost no charge flows
Most other materials
Some materials are semiconductors.
Insulators and Conductors
(a) A charged metal sphere and a neutral metal sphere.
(b) (b) The two spheres connected by a conductor (a metal nail), which conducts
charge from one sphere to the other.
(c) (c) The two spheres connected by an insulator (wood); almost no charge is
conducted.
11. Induced Charge
Metal objects can be charged by conduction:
A neutral metal rod in (a) will acquire a positive charge if placed in contact (b) with
a positively charged metal object. (Electrons move as shown by the orange arrow.)
This is called charging by conduction.
- +ve charged metal is
brought close to
uncharged object
-If the 2 object
touch, free e- in neutral
are attracted to +ve
charged and pass
over to it.
- so,nuetral metal rod
now will miss –ve e
and will have net +ve
charge
12. Charging a metallic object by induction (that
is, the two objects never touch each other).
(a) A neutral metallic sphere, with equal numbers
of positive and negative charges.
(b) The electrons on the neutral sphere are
redistributed when a charged rubber rod is
placed near the sphere.
(c) When the sphere is grounded, some of its
electrons leave through the ground wire.
(d) When the ground connection is removed, the
sphere has excess positive charge that is
nonuniformly distributed.
(e) When the rod is removed, the remaining
electrons redistribute uniformly and there is a
net uniform distribution of positive charge on
the sphere.
13. They can also be charged by induction, either
while connected to ground or not:
Induced Charge
Charging by induction.
Inducing a charge on an object connected to ground.
14. They can also be charged by induction, either
while connected to ground or not:
Induced Charge
Charging by induction.
Inducing a charge on an object connected to ground.
• both object do not touch
•Free electron of metal rod do
not leave the rod- they will
move within the metal toward
the external +ve charged and
leaving charged at opposite
end
•So, charged is induced at the
2 end of metal rod
17. Coulomb’s Law
Experiment shows that the electric force
between two charges is proportional to the
product of the charges and inversely
proportional to the distance between them.
18. Experiment shows that the electric force
between two charges is proportional to the
product of the charges and inversely
proportional to the distance between them.
Coulomb’s Law
Coulomb’s law, Eq. 21–1, gives the force between two point charges, Q1
and Q2, a distance r apart.
19. Properties of electric force
between two stationary charge
particles: The electric force..
• is inversely proportional to square of the
separation between particles and directed along
the line joining them
• is proportional to the product of the charges q1
and q2 on the two particles
• is attractive if charges are of opposite sign and
repulsive if the charges are of the same sign
• Is a conservative force
20. Coulomb’s Law equation
• An equation giving the magnitude of electric
force between two point charges
• (Point charges defined as a particle of zero
size that carries an electric charge)
2
21
ee
r
qq
kF
Where ke is called the Coulomb constant and
ke = 8.9875 x 109 Nm2C-2 (S.I units) or
ke = 1/ 4πЄ0 and
Є0 = permittivity of free space
= 8.8542 x 10-12 C2N-1m-2
22. Coulomb’s Law
The force is along the line connecting the
charges, and is attractive if the charges are
opposite, and repulsive if they are the same.
The direction of the static
electric force one point
charge exerts on another
is always along the line
joining the two
charges, and depends on
whether the charges have
the same sign as in (a)
and (b), or opposite signs
(c).
23. Coulomb’s Law
Unit of charge: coulomb, C
The proportionality constant in Coulomb’s
law is then:
Charges produced by rubbing are
typically around a microcoulomb:
26. Two point charges separated by a distance r exert a force on
each other that is given by Coulomb’s law. The force F21
exerted by q2 on q1 is equal in magnitude and opposite in
direction to the force F12 exerted by q1 on q2. When the
charges are of the same sign, the force is repulsive.
Electric Force is a vector
27. When the charges are of opposite signs, the
force is attractive.
28. rF ˆ
2
21
e12
r
qq
k
Where, is a unit vector directed from q1 to q2.
Since the force obeys Newton’s third law, then
F12 = - F21
rˆ
29.
30. Example: Question 1
• The electron and proton of a hydrogen
atom are separated by a distance of
approximately 5.3 x 10-11 m. Find the
magnitude of the electric force.
32. Coulomb’s Law
Example 2: Three charges in a line.
Three charged particles are arranged in a
line, as shown. Calculate the net electrostatic
force on particle 3 (the -4.0 μC on the right) due
to the other two charges.
33. Exercise
1. What is the magnitude of the force a +25
µC charge exerts on a +2.5 mC charge
28 cm away?
34. Exercise
2. Three point charges, Q1 = 3 µC, Q2 = -5 µC,
and Q3 = 8 µC are placed on the x-axis as
shown in Figure 1. Find the net force on the
charge Q2 due to the charges Q1 and Q3.
Q1
20 cm 30 cm
Q2 Q3
35. Exercise
3. Particles of charge +75, +48 and -85 µC
are placed in a line . The center one is
0.35 m from each of the others. Calculate
the net force on each charge due to the
other two.
36. Coulomb’s Law
Example 3: Electric force using vector components.
Calculate the net electrostatic force on charge Q3 shown in the figure due to the
charges Q1 and Q2.
37. Coulomb’s Law
Approach
1. We use Coulomb’s law to find the
magnitude of the individual
forces.
2. The direction of each force will be
along the line connecting Q3 to
Q1 or Q2.
3. The forces F31 and F32 have the
directions shown in figure,
Q1 exerts an attractive force on
Q3
Q2 exerts a repulsive force on Q3
4. The forces F31 and F32 are not in
the same line, so to find the
resultant force on Q3, we resolve
F31 and F32 into x and y
components and perform vector
addition.
38. Exercise
1. Three charged particles are placed at the
corners of an equilateral triangle of side
1.20 m . The charges are +7.0µC, -
8.0µC and -6.0µC. Calculate the
magnitude and direction of the net force
on Q1 due to the other two.
39. Electrical Force with Other
Forces, Example
The spheres are in equilibrium.
Since they are separated, they exert
a repulsive force on each other.
– Charges are like charges
Model each sphere as a particle in
equilibrium.
Proceed as usual with equilibrium
problems, noting one force is an
electrical force.
Section 23.3
40. Electrical Force with Other
Forces, Example cont.
The force diagram includes the
components of the tension, the
electrical force, and the weight.
Solve for |q|
If the charge of the spheres is not
given, you cannot determine the sign
of q, only that they both have same
sign.
Section 23.3
41. Examples
Two indentical small spheres, each having a
mass of 3.00 x 10-2 kg, hang in equilibrium
as shown in Figure. The length, L of each
string is 0.150m and the θ= 5.000. Find the
magnitude of the charge on each sphere.
42. • Two kinds of electric charge – positive and
negative.
• Charge is conserved.
• Charge on electron:
e = 1.602 x 10-19 C.
• Conductors: electrons free to move.
• Insulators: nonconductors.
Summary
43. • Charge is quantized in units of e.
• Objects can be charged by conduction or
induction.
• Coulomb’s law:
Summary