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(a) With the help of a diagram , explain...

(a) With the help of a diagram , explain the principle and working of a moving coil galvanometer .
(b) What is the importance of a radial magnetic field and how is it produced ?
(c) Why is it while using a moving coil galvometer as a voltmeter a high resistance in series is required whereas in an ammeter a shunt is used ?

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