Question:
A magnet is moved towards the coil (i) quickly (ii) slowly then the induced emf is
A magnet is moved towards the coil (i) quickly (ii) slowly then the induced emf is
Updated On: Jul 5, 2022
- Larger in case (i)
- Smaller in case (i)
- Equal in both
- Larger or smaller depending upon the radius of the coil
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The Correct Option is B
Solution and Explanation
According to Faraday's Law: $E =\frac{ d \phi}{ dt }$
If the magnet moves quickly,
the rate of change of flux is also higher,
hence the EMF induced is larger in case (i).
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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