Question:
Eddy currents are produced when
Eddy currents are produced when
Updated On: Jul 28, 2022
- a metal is kept in varying magnetic field
- a metal is kept in the steady magnetic field
- a circular coil is placed in a magnetic field
- through a circular coil current is passed
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The Correct Option is A
Solution and Explanation
Suppose a metal plate is kept in a magnetic field. On the surface of the metal plate, we can imagine a loop, which will be associated with a magnetic flux due to the magnetic field. As the magnetic field is changing, there is change of magnetic flux through this loop and so an electric current is going to be induced in the loop, which is known as the eddy current.
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Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
- When we place the conductor in a changing magnetic field.
- When the conductor constantly moves in a stationary field.
Formula:
The electromagnetic induction is mathematically represented as:-
e=N × d∅.dt
Where
- e = induced voltage
- N = number of turns in the coil
- Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
- t = time
Applications of Electromagnetic Induction
- Electromagnetic induction in AC generator
- Electrical Transformers
- Magnetic Flow Meter