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A moving coil galvanometer has resistance 50 Ω and full deflection current is 5 mA.

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+1 vote
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in Physics by (48.9k points)

A moving coil galvanometer has resistance 50 Ω and full deflection current is 5 mA. The resistance needed to convert this galvanometer into voltmeter of range 100 volt is 

(1) 19550 Ω

(2) 18500 Ω 

(3) 19850 Ω 

(4) 18760 Ω

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1 Answer

+1 vote
by (47.8k points)

(1) 19550 Ω

Ig(G + R) = 100 V 

5  × 10-3 (50 + R) = 100 20 

50 + R = 20000 

R = 19550 Ω

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