1. When a current-carrying wire passes through a magnetic field perpendicular to it, the wire experiences a force perpendicular to both the wire and the magnetic field. Reversing either the current or the magnetic field reverses the direction of the force.
2. A coil carrying a current in a magnetic field experiences a turning force due to the interaction between the magnetic fields. In a DC motor, this principle is used to convert electrical energy to mechanical motion as the turning coil is connected to a power source via a split-ring commutator.
3. The split-ring commutator continuously reverses the current in the coil to keep it turning in one direction. The coil is wound around a soft iron
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.
Discusses Ohm's Law and current electricity and related to energy transfer in circuits.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Discusses Ohm's Law and current electricity and related to energy transfer in circuits.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Magnetism and Electricity - ppt useful for grade 6,7 and 8tanushseshadri
Magentismand Electricity - ppt useful for grade 6,7 and8
Content
Magnets
Electromagnets
Electric bell
bar magnet
permanent magnet
Electromagnetism
Materials used to make a magnet
lodestone etc
Hope u guys like it
Describes electrostatic principles and concepts.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Magnetic Effects of Electric Current for Grade 10th StudentsMurari Parashar
In this chapter, we will study the effects of electric current : Moving charges or electric current generates a magnetic field. This is useful to CBSE Students.
Detection of Radioactivity
Characteristics of the Three Types of Emission
Nuclear Reactions
Half-Life
Uses of Radioactive Isotopes Including Safety Precautions
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
2. FORCE ON A CURRENT-
CARRYING CONDUCTOR
State the relative directions of force, field and current.
3. • When a wire carrying an electric current passes through a
magnetic field, with the field at right-angles to the wire, the
wire will experience a force at right-angles both to wire
and to the magnetic field.
Electromagnetism 3
Fleming’s Left-Hand Rule
The direction in which the
conductor moves can be
deduced using Fleming’s
left-hand rule (or motor
rule)
4. FORCE ON A CURRENT-
CARRYING CONDUCTOR
Describe experiments to show the force on a current-
carrying conductor, and on a beam of charged particles,
in a magnetic field, including the effect of reversing (1)
the current, (2) the direction of the field.
5. Force on a Current-Carrying Conductor
Electromagnetism 5
7. • The force exerted on the conductor can be explained by
considering the combined fields due to current flowing
through the straight conductor and the magnet.
Electromagnetism 7
magnetics field between 2 magnets magnetic effect due to current in the wire
8. • The field shows that on
one side of the
conductor, the two fields
are acting in the same
direction and they will
combine to give a
stronger field.
• On the other side of the
conductor, the two fields
oppose each other and
give a weaker field.
Electromagnetism 8
9. • The unbalanced fields
on both sides of the
conductor produce the
force that is exerted on
the conductor.
Electromagnetism 9
10. Force on Beam of Charge Particles
• In the deflection tube,
the electron gun shoots
out a beam of electrons
across an evacuated
tube.
• It hits a fluorescent
screen placed in its path
and when it does the
screen glows.
• If a bar magnet is held at
the side of the tube, the
beam of electrons is
seen to be deflected up
or down.
Electromagnetism 10
13. FORCE ON A CURRENT-
CARRYING CONDUCTOR
Describe the field patterns between currents in parallel
conductors and relate these to the forces which exist
between the conductors (excluding the Earth’s field).
14. Force Between Two Parallel, Current-
carrying Conductors
• When a current is set
to flow on two parallel
strips of aluminum, the
magnetic fields due to
each wire will interact
and a force will act on
each of the wires
Electromagnetism 14
17. THE D.C. MOTOR
Explain how a current-carrying coil in a magnetic field
experiences a turning effect and that the effect is
increased by increasing (1) the number of turns on the
coil, (2) the current.
18. Turning Effect on a Current-Carrying
Conductor
• If a current carrying coil
is placed in a magnetic
field, a pair of forrces will
be produced on the coil.
• This is due to the
interaction of the
magnetic filed of the
permanent magnet and
the magnetic field of the
current carrying coil.
Electromagnetism 18
19. • The field of a coil superimposed on the field of a
horseshoe magnet
Electromagnetism 19
20. • Combined field results in a pair of equal and opposite
forces F
Electromagnetism 20
22. THE D.C. MOTOR
Discuss how this turning effect is used in the action of
an electric motor.
23. D.C Motor
• A simple electric motor can be built using a coil of wire
that is free to rotate between two opposite magnetic
poles. When an electric current flows through the coil, the
coil experiences a force and moves.
Electromagnetism 23
28. Describe the action of a split-ring commutator in a two-
pole, single-coil motor and the effect of winding the coil
onto a soft iron cylinder.
Electromagnetism 28
29. Action of Commutator
• A split-ring commutator is a device for reversing the
current direction every half turn.
Electromagnetism 29
30. • As the motor rotates, first one piece of copper, then the
next connects with the brush every half turn. The wire on
the left side of the armature always has current flowing in
the same direction, and so the armature will keep turning
in the same direction
Electromagnetism 30
31. Soft Iron Cylinder
• The coils are wound on a iron core called armature makes
the magnetic field stronger because it becomes a magnet itself
when the current is flowing.
• It is used because it loses its magnetism as soon as the current
stops flowing. In this way, the electromagnet can be switched
on and off by turning the electricity on and off.
Electromagnetism 31
32. 1. When the electric current in wire XY is in the direction
shown, there is an upward force on the wire.
Electromagnetism 32
33. 1. If the north and south poles of the magnet exchange
positions, in which direction will the force on the wire
act?
A. downwards
B. upwards
C. to the left
D. to the right
Electromagnetism 33
34. 2. A copper wire is held between the poles of a magnet.
Electromagnetism 34
35. 1. The current in the wire can be reversed. The poles of
the magnet can also be changed over.
2. In how many of the four directions shown can the force
act on the wire?
A. 1
B. 2
C. 3
D. 4
Electromagnetism 35
36. 3. An a.c. supply is connected to a wire stretched between
the poles of a magnet.
Electromagnetism 36
37. 1. Which way will the wire move?
A. left and right
B. right only
C. up and down
D. up only
Electromagnetism 37
38. 4. The diagram shows a beam of electrons entering a
magnetic field. The direction of the field is into the page.
Electromagnetism 38
39. 1. In which direction are the electrons deflected?
A. into the page
B. out of the page
C. towards the bottom of the page
D. towards the top of the page
Electromagnetism 39
40. 5. The diagram shows a beam of electrons entering a
magnetic field.
Electromagnetism 40
41. 1. What is the effect of the magnetic field on the electrons?
A. They are deflected into the plane of the diagram.
B. They are deflected out of the plane of the diagram.
C. They are deflected towards the bottom of the diagram.
D. They are deflected towards the top of the diagram.
Electromagnetism 41
42. 6. Each diagram shows a cross-section through two
parallel conductors, each carrying an electric current.
7. In the conductor on the left, the current is into the page;
on the right, it is out of the page.
8. Which diagram shows the directions of the forces on the
two conductors?
Electromagnetism 42
C
43. 7. Each of the diagrams is a cross-section through two
parallel, current-carrying conductors.
8. Which diagram shows correctly the magnetic field
pattern and the directions of the forces on the two
conductors?
Electromagnetism 43
45. 8. Two parallel vertical wires P and Q are a small distance
apart in air. There is a downwards electric current in
both wires. A force acts on Q owing to the current in P.
This force is perpendicular to the wire Q.
9. What is the direction of the force on Q?
Electromagnetism 45
D
46. 9. X and Y are wires carrying electric currents at right
angles to the page. P, Q and R are plotting compasses.
Any effect of the Earth’s magnetic field has been
ignored.
Electromagnetism 46
47. 1. What is true about the direction and size of the
currents?
Electromagnetism 47
A
48. 10. A long flexible wire is wrapped round two wooden pegs.
A large current is passed in the direction shown.
Electromagnetism 48
49. 1. Which two pairs of lengths of wire attract each other?
Electromagnetism 49
B
50. 11. A coil, carrying a current, is arranged within a magnetic
field. The coil experiences forces that can make it move.
Electromagnetism 50
51. 1. In which direction does the coil move?
A. along the magnetic field
B. from X to Y
C. out of the paper
D. turns about the axis XY
Electromagnetism 51
52. 12. A d.c. motor consists of a coil of many turns rotating in a
fixed magnetic field. The coil is connected to a d.c.
supply through a split-ring commutator.
Electromagnetism 52
53. 1. Some changes are made, one at a time.
• The d.c. supply is reversed.
• The coil is turned before switching on, so that P starts on the right
and Q on the left.
• The poles of the magnet are reversed.
• The turns on the coil are increased in number.
2. How many of these changes make the coil rotate in the
opposite direction?
A. 1
B. 2
C. 3
D. 4
Electromagnetism 53
54. 13. What does not alter the size of the turning effect on the
coil of an electric motor?
A. the direction of the current in the coil
B. the number of turns in the coil
C. the size of the current in the coil
D. the strength of the magnetic field
Electromagnetism 54
55. 14. A simple model of a d.c. motor is made. By mistake, the
split-ring commutator is left out. The coil can turn, but is
always connected to the battery in the same way.
Electromagnetism 55
56. 1. The coil starts in the horizontal position.
2. What happens to the coil when the circuit is switched
on?
A. It does not move at all.
B. It moves upwards, out of the magnetic field.
C. It turns to the vertical position and eventually stops there.
D. It turns to the vertical position then comes back to the horizontal
position.
Electromagnetism 56
57. 15. The diagram shows a coil in a magnetic field.
Electromagnetism 57
58. 1. When the coil is part of a d.c. motor, what must be
connected directly to X and Y?
A. d.c. supply
B. slip rings
C. soft-iron core
D. split-ring commutator
Electromagnetism 58
60. 1. Why is a split-ring commutator used?
A. to change the current direction in the coil as the coil passes the
horizontal position
B. to change the current direction in the coil as the coil passes the
vertical position
C. to change the current direction in the d.c. supply as the coil
passes the horizontal position
D. to change the current direction in the d.c. supply as the coil
passes the vertical position
Electromagnetism 60
61. 17. In a d.c. motor, the coil is wound on a soft iron cylinder.
18. Why is soft iron used?
A. to increase the strength of the magnetic field
B. to increase the weight of the coil
C. to insulate the coil from the magnet
D. to prevent the coil from spinning too quickly
Electromagnetism 61