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  4. To convert a galvanometer into a voltmeter one should connect a: -

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Q. To convert a galvanometer into a voltmeter one should connect a : -

AIPMTAIPMT 2002Moving Charges and Magnetism

Solution:

Key Idea: A galvanometer has its own resistance low but a voltmeter must have high resistance. A voltmeter indeed is a modified form of a pivoted coil galvanometer. Since the resistance of coil of galvanometer of its own is low, its resistance is to be increased as is a necessary condition for a voltmeter. For this an appropriate high resistance should be connected in series with the galvanometer as shown. Note: The resistance of an ideal voltmeter should be infinite.

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