Question:
If a magnet is dropped through a vertical hollow copper tube then
If a magnet is dropped through a vertical hollow copper tube then
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Conductors + changing magnetic field → eddy currents → motion slows.
Updated On: May 1, 2026
- the time taken to reach the ground is longer than the time taken if the tube was made out of plastic
- the magnet will get attracted and stick to the copper tube
- the time taken to reach the ground is longer than the time taken if the tube was made of stainless steel
- the time taken to reach the ground does not depend on the radius of the copper tube
- the magnet will be repelled away by the tube
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The Correct Option is A
Solution and Explanation
Concept:
When a magnet falls through a conducting tube, eddy currents are induced due to changing magnetic flux. These currents oppose motion (Lenz’s law).
Step 1: Eddy current effect.
Induced currents create magnetic field opposing motion.
Step 2: Result.
Magnet falls slowly.
Step 3: Comparison.
Plastic tube → no currents → faster fall.
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