1. Every magnet has two poles, north and south, and magnetic fields are described by field lines that run from the north to the south pole.
2. A current-carrying wire in a magnetic field experiences a force perpendicular to both the current and the magnetic field. Fleming's left hand rule can be used to determine the direction of this force.
3. Charged particles like electrons moving through a magnetic field experience a force perpendicular to their motion, causing them to travel in a circular path. The magnetic field provides the centripetal force.
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
This is a summary of the topic "Energy, work and power" in the GCE O levels subject: Physics. Students taking either the combined science (chemistry/physics) or pure Physics will find this useful. These slides are prepared according to the learning outcomes required by the examinations board.
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
This is a summary of the topic "Energy, work and power" in the GCE O levels subject: Physics. Students taking either the combined science (chemistry/physics) or pure Physics will find this useful. These slides are prepared according to the learning outcomes required by the examinations board.
e can define motion as the change of position of an object with respect to time. A book falling off a table, water flowing from the tap, rattling windows, etc., all exhibit motion. Even the air that we breathe exhibits motion! Everything in the universe moves
Very important Chapter of physics because it contains all the important laws needed to understand concepts in physics.
And i hope it will be helpful to you
Contents
Magnets, Ferromagnets and Electromagnets
Magnetic Fields and Magnetic Field Lines
Magnetic Field Strength: Force on a Moving Charge in a Magnetic Field
The Hall Effect
Magnetic Force on a Current-Carrying Conductor
Torque on a Current Loop: Motors and Meters
Magngetic Fields Produced by Currents: Ampere‘s Law
Magnetic Force between Two Parallel Conductors
Describe the difference between the north and south poles of a magnet.
Describe how magnetic poles interact with each other.
Define Ferromagnet.
Describe the role of magnetic domain in magnetization.
Describe the relationship between electricity and magnetism.
Magnetic effect of electric current of class 10th.All you need from this chapter is available here.convenient for studying this chapter of class 10 NCERT book.BEST FOR EXAMS!
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
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Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
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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!
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.
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.
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.
2. Magnetic Poles
Every magnet has two poles (North & South) and is therefore called a Dipole
Unlike Electric Fields it is impossible to have a Monopole.
If you cut a magnet in half you end up with another dipole.
N S
N S N S
Unlike poles attract, Like poles repel.
N S N S
N S
S N
These magnets will turn so that UNLIKE poles come together.
3. Earth’s Magnetic Field
Because magnets will turn so that UNLIKE poles come together, the poles
are really called ‘North seeking poles’ or ‘South seeking poles’
Compasses contain
small magnets which
turn towards the
Earth’s poles.
N
S
http://phet.colorado.edu/en/simulation/magn
ets-and-electromagnets
4. Magnetic Field Lines
Magnetic Field
This is a region of space where a test magnet experiences a turning force
http://www.walter-fendt.de/ph14e/mfbar.htm
Field Lines
They point from the North Pole to the South Pole.
5. Magnetic Flux Density (B)
The strength of the magnetic field seems
linked to the density of the magnetic field
lines.
There is a stronger field at the poles where
there are more field lines.
Magnetic Flux Density (B)
This is the equivalent of:
g for Gravitational Fields (Nkg-1)
E for Electric Fields (NC-1)
The unit of Magnetic Flux Density (B) is the Tesla (T) and like the other
field strengths it is a Vector.
A good way to think about it is that it is just a measure of how many Field
Lines there are in a certain area. A magnetic field is often called a ‘B Field’
Until we know more about Magnetism it isn’t possible to define The
Magnetic Field Density (B) in the same way as we do for Gravitational
Field Strength (g) and Electric Field Strength (E)
6. Fields Caused by Currents
It turns out that if a small
compass is placed near a
wire carrying a current it
experiences a weak turning
force.
This led scientists to realise
that Magnetism is actually
caused by moving charges.
The field is strongest closest The fingers show
the direction of
to the wire. the field.
The direction of the field can
be found using the Right
Hand Corkscrew Rule.
http://www.walter-
fendt.de/ph14e/mfwire.htm
7. Field inside a coil
When a current flows All these circles add This makes a really
around a circular loop together. strong field in the
the magnetic field centre of the circular
forms circles. loop.
8. Field inside a solenoid
A solenoid is a coil of
wire, carrying a current.
The field that is created
by a solenoid is just like
that of a bar magnet but
the field lines go
through the centre.
10. Changing the direction of the force review
The direction of the force acting on a wire in an
electromagnetic field can be reversed by:
Reversing the Current Reversing the Magnetic Field
The direction of the force is therefore relative to both the
direction of the magnetic field and the current.
11. Fleming’s left-hand rule review
It is possible to predict the direction of the force acting on a
wire – its motion – if the direction of the current or the
magnetic field are known. Fleming’s left-hand rule is used
to do this.
thuMb = Motion
First finger = magnetic Field
seCond finger = Current
13. Force in a Magnetic Field equation
As you have just seen the size of the force depends on:
B – Magnetic Flux Density
I – current in the wire
l – length of wire
If the field is not at Right Angles to the wire then the perpendicular component
of the field is used and the equation is:
14. Force in a Magnetic Field alternative equation
B – Magnetic Flux Density
I – current in the wire
l – length of wire
1. 2. 3. 4.
15. Charges in Magnetic Fields . = B Field coming out of page
1. Electrons moving in a wire ⨯ B Field going away into page
=
Imagine an arrow coming towards
you or going away from you.
In the picture above, the electron is moving to the right, so Conventional Current (I) is
moving to the left.
From Fleming’s Left Hand Rule the electron experiences a force downwards at right
angles to it’s motion. It’s the sum of all the forces on all the electrons that gives the
total force on the wire.
2. Electrons moving freely through a magnetic field
The force is always perpendicular to it’s motion, so it
ends up moving in a circle.
The Magnetic Field provides the Centripetal Force.
16. What forces are there between two current carrying wires?
Step 1 – What does I2 do to I1 ?
Use the Right Hand Corkscrew rule to see what the field lines do.
Step 2 – Which way does I1 move?
Use Fleming’s Left Hand Rule
to see what the force is on I1
F
17. Now repeat for the other wire:
Force caused by I2 on I1 Force caused by I1 on I2
F
F
The two wires move together!
18. If the currents are flowing in opposite directions:
I I
If the currents are flowing in opposite directions:
19. What would happen to a coil?
What happens to the shape of the coils?
20. What would happen to a coil?
http://ocw.mit.edu/ans7870/8/8.02T/f04/visualizations/magnetostatics/15
-MagneticForceAttract/MagForceAtt_640.mpg
21. Aurora Borealis
Knut Birkeland (1867–1917) is on
the 200 Norwegian kroner note.
He was a Physicist best known for
his studies on the aurora borealis.
Timelapse of the Aurora
http://vimeo.com/16917950
22. Aurora Borealis – the Physics
The Earth has a magnetic field caused by currents in its core, which channels
charged particles from solar flares and from our upper atmosphere towards
the poles
23. Aurora Borealis – the Physics
Charged particles from space
experience a force on them from
the earth’s magnetic field which
makes them spiral around the
magnetic field lines and head
towards the poles.
As they meet air molecules they
excite the molecules causing
them to give out light.
Without the protection of the
earth’s magnetic field we would
be constantly bombarded with
high energy particles.
This is one of the reasons that Space flight is so difficult. Astronauts report
white flashes in their vision as Cosmic rays pass straight through their heads.
Without shielding missions to Mars will be impossible.