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  4. A voltmeter has resistance of G ohm and range of V volt.The resistance required in series to convert it into a voltmeter of range n V volt is

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Q. A voltmeter has resistance of G ohm and range of V volt.The resistance required in series to convert it into a voltmeter of range n V volt is

Gujarat CETGujarat CET 2007Current Electricity

Solution:

Resistance required in series is
$ R = \frac{V}{I_g} - G = \frac{nV}{\bigg(\frac{V}{G} \bigg)} - G = (n - 1) G $