Question:
A closed iron ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is
A closed iron ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is
Updated On: Jul 2, 2022
- equal to $g$
- less than $g$
- more than $g$
- depends on the diameter of the ring and length of magnet
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The Correct Option is B
Solution and Explanation
Acceleration of the magnet will not be equal to $g$. It will be less than $g$. This is because, as the magnet falls, amount of magnetic flux linked with the ring changes
An induced emf is developed in the ring which opposes the downward motion of the magnet
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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