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Answer in brief: If a copper disc swings between the poles of a magnet, the pendulum comes to rest very quickly. Explain the reason. What happens to the mechanical energy of the pendulum? - Physics

Short Note

Answer in brief:

If a copper disc swings between the poles of a magnet, the pendulum comes to rest very quickly. Explain the reason. What happens to the mechanical energy of the pendulum?

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Solution

As the copper disc enters and leaves the magnetic field, the changing magnetic flux through it induces eddy current in the disc. In both cases, Fleming's right-hand rule shows that opposing magnetic force damps the motion. After a few swings, the mechanical energy becomes zero and the motion comes to a stop. Joule heating due to the eddy current warms up the disc. Thus, the mechanical energy of the pendulum is transformed into thermal energy.

Concept: Induction and Energy Transfer
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APPEARS IN

Balbharati Physics 12th Standard HSC Maharashtra State Board
Chapter 12 Electromagnetic induction
Exercises | Q 2.4 | Page 286
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