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Moving Charges And Magnetism
Question
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The coils, in certain galvanometers, have a fixed core made of a non-magnetic matallic materials.
Why does the oscillating coil come to rest so quickly such a core?  

Answer

Eddy current acting in the core gives rise to restoring torque. And, this restoring torque tries to bring back the coil back to it's original position. Hence, the oscillating coil comes to rest quickly.

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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.