First slide

Magnetic flux and induced emf

Question

The pointer of a dead-beat galvanometer gives a steady deflection because

Moderate

A

Eddy currents are produced in the conducting frame over which the coil is wound
B

Its magnet is very strong
C

Its pointer is very light
D

Its frame is made of abonite

Solution

In a dead beat galvanometer, the coil is wound on a metallic frame such that when the current flows through the conductor, as the pointer moves through a changing magnetic field, an eddy current in induced in the metallic frame which opposes the motion of the pointer beyond the mean value, hence dampens the motion very quickly.

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