EMI - Current in solenoid due to magnet

In summary, EMI stands for electromagnetic induction and is the production of an electromotive force in a conductor when exposed to a changing magnetic field. A solenoid is a coil of wire that creates a magnetic field when an electric current is passed through it. EMI current is induced in a solenoid when placed near a magnet, and its strength is affected by the strength of the magnetic field, number of turns, and rate of change. EMI current has practical applications in devices such as generators, transformers, and motors, as well as technologies like wireless charging, electromagnetic brakes, and induction heating.
  • #1
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Homework Statement



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The Attempt at a Solution



Suppose that N pole of magnet is facing the solenoid
considering view from magnet
when the magnet moves close ... current is anticlockwise and increase from 0 to max till magnet reach starting of solenoid
when it enters the solenoid . some part will give opposite current and thus net current starts decreasing till 0 when magnet is in middle. now when magnet moves away ... the field due to south pole increase
so again current is anticlockwise

but answer is (c)

please someone explain me this
 

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  • #2
some help please
 

What is EMI?

EMI stands for electromagnetic induction, which refers to the production of an electromotive force (EMF) in a conductor when it is exposed to a changing magnetic field.

What is a solenoid?

A solenoid is a coil of wire that is tightly wound into a helix shape. It is typically used to create a magnetic field when an electric current is passed through it.

How does EMI affect the current in a solenoid?

When a solenoid is placed near a magnet, a changing magnetic field will be induced in the solenoid. This changing magnetic field will then generate an electric current in the solenoid, known as EMI current.

What factors affect the strength of EMI current in a solenoid?

The strength of EMI current in a solenoid is affected by the strength of the magnetic field, the number of turns in the solenoid, and the rate of change of the magnetic field.

How is EMI current used in practical applications?

EMI current in solenoids is used in various devices, such as generators, transformers, and motors. It is also used in technologies like wireless charging, electromagnetic brakes, and induction heating.

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