Question:
A metal plate can be heated by
A metal plate can be heated by
Updated On: Jul 2, 2022
- passing either a direct or alternating current through the plate
- placing in a time varying magnetic field
- placing in a space varying magnetic field, but does not vary with time
- both $(a)$ and $(b)$ are correct
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The Correct Option is D
Solution and Explanation
When a metal plate is getting heated, it may be due to the passage of direct current, alternating current or even induced current through the plate. As time varying magnetic field produces induced current in the plate, so both are correct
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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