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Moving Charges And Magnetism
Question
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The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping? 

Answer

The changing magnetic flux through the plate produces a strong eddy current in the direction, which opposes the cause as the plate oscillates. 

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Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω   N1 = 30,
A1 = 3.6 x 10–3 m2,  B1 = 0.25 T
R2 = 14 Ω;  N2 = 42,
A2 = 1.8 x 10–3 m2, B2 = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.