Notes on electro-magnetic Induction
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Electro-magnetic Induction:-
Why does the coil rotate when the current is switched on?
When the current is switched on, current passes in A upward and B downward. According to fleming's, force on A is towards the pase and B is away from the pase, so A goes in and B comes out, hence a torque is prroduced and the coil rotates.
Electrostatic induction:- When a coducting wire cuts the magnetic field line of a magnet by moving parpenticularly with the magnetic field. Then the free electron on the conducting wire is given a push, hence electron lose and electric current is made. This phenomenon is known as electeomagnetic induction.
Direction of the current can be found by fleming's side hand rule.
The rule:- The magnetic field is shown by our fourth finger and the movement of the wire is shown by our thumb. Then the direction of the current will be shown by our third finger.
Energy change:- Here kinetic energy is changed into electrical energy.
Practical use:- Practically, this is used in dynamos or generators to generate electricity.
There is no battery or cells in the diagram above, but still current is passing. It is because A side of the coil is goind towards the pase and B side of the coil is going out from the pase, this is how current is produced according to Fleming's right hand rule.
Answer:
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.
Explanation:
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