Question:
An iron ring is held horizontally and a bar magnet is dropped gently through the ring with its length coinciding with the axis of the ring. The acceleration of the freely falling magnet (\(g\) = acceleration due to gravity) is
An iron ring is held horizontally and a bar magnet is dropped gently through the ring with its length coinciding with the axis of the ring. The acceleration of the freely falling magnet (\(g\) = acceleration due to gravity) is
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Induced currents always oppose motion (Lenz’s law).
Updated On: Apr 24, 2026
- is less than g
- is equal to g
- is greater than g
- depends on the radius of the ring
- depends on the length of the magnet
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The Correct Option is A
Solution and Explanation
Concept:
Electromagnetic induction produces opposing force.
Step 1: As magnet falls.
Changing magnetic flux induces current.
Step 2: Lenz’s law.
Induced current opposes motion.
Step 3: Result.
Acceleration decreases: \[ a<g \]
Step 1: As magnet falls.
Changing magnetic flux induces current.
Step 2: Lenz’s law.
Induced current opposes motion.
Step 3: Result.
Acceleration decreases: \[ a<g \]
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