A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is
A
nG
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B
G/n
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C
G/(n−1)
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D
(n−1)G
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Solution
The correct option is C(n−1)G Voltmeter resistance G ohm and voltage V. Initially, V=IgG Ig=VG Let R be the required resistance in series to convert it into voltmeter of range V1=nV Required resistance can be found from: V1=Ig(G+R) nV=VG(G+R) G+R=nG ∴R=(n−1)G