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Q.

The resistance of a moving coil galvanometer is 20Ω. It requires 0.01 A current for full scale deflection. Calculate the value of resistance required to convert it into a voltmeter of range 20 volt:

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a

1980 Ω

b

2000 Ω

c

1880 Ω

d

1500 Ω

answer is A.

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Detailed Solution

V = i (R + G)20 = (0.01) (20 + R)R=1980Ω
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