Sat February 18, 2012 By: Manpreet Kataria

what is the use eddy current in moving coil galvanometer?

Expert Reply
Sat February 18, 2012
There are times when eddy current damping can be put to good use. For example, in a moving coil galvanometer, the pointer is light and highly sensitive. When displaced by a current, it tends to oscillate back and forth, coming to rest slowly. This may take several seconds. Clearly, when such a metre is used extensively, it is desirable to eliminate the oscillation time. This may be done easily by placing a light metal plate on the bottom end of the pointer and allowing the plate to swing between the poles of a small magnetic field. This is usually enough to damp the motion of the pointer and bring it to rest quickly.
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