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Mixed Combination of Cells

A galvanomete...

Question

A galvanometer with scale divided into 100 equal divisions has current sensitivity 20 divisions per 1 mA and voltage sensitivity 1 division per 1 mv. If it is converted in to a voltmeter to read maximum potential of 5V, then the resistance of the voltmeter will be

A

980 ohm

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B

1000 ohm

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C

1020 ohm

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D

Infinity

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Solution

The correct option is B 1000 ohm
$V = i_{g} [R + G] | i_{g} = 5 m A 5 = 5 \times 10^{- 3} [R + G] R_{v} = R + G = 1000 Ω$

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