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Moving Charges And Magnetism

Question
CBSEENPH12038963
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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? 

Solution

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

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.

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