CBSE 2025, Set 2

Question

A vertically held bar magnet is dropped along the axis of a copper ring having a cut as shown in the diagram. The acceleration of the falling magnet is:

![Bar magnet falling through a cut copper ring](https://www.edvaya.com/images/cbse/physics/2025/set2/q02-magnet-falling-cut-ring.webp) A). zero B). less than $g$ C). $g$ D). greater than $g$

Edvaya · Accepted Answer

The correct answer is $g$. According to Faraday's law of electromagnetic induction, an emf is induced in the copper ring as the magnet falls and changes the magnetic flux linked with it.

However, because the ring has a **cut**, it does not form a closed electrical circuit. Therefore, no induced current can flow through it.

Since there is no induced current, there is no opposing magnetic field created by the ring (Lenz's law cannot manifest as an opposing force). The magnet does not experience any upward magnetic force and falls freely under gravity.

Thus, the acceleration of the magnet is $\boxed{g}$.

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Physics > Magnetism Induction And Alternating Current > Electromagnetic Induction

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