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Electric Charges and Fields
Question
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The motion of a copper plate is damped when it is allowed to oscillate between the pole pieces of a magnet. State the cause of this damping.

Answer

This damping is due to the eddy current developed in between the copper plate. When copper plate oscillates between the pole pieces of the magnet, the flux linked with copper plate changes and eddy currents (induced current) are developed which opposes the cause of the production.

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Some More Questions From Electric Charges and Fields Chapter

a) An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
b) Explain why two field lines never cross each other at any point?