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Q.

The sensitivity of a galvanometer that measures current is decreased by 1/40 times by using shunt resistance of 10Ω. Then, the value of the resistance of the galvanometer is

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a

410Ω

b

30Ω

c

390Ω

d

400Ω

answer is D.

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Detailed Solution

S=Gn−1;S=10,n=4010=G40−1;G=390Ω

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The sensitivity of a galvanometer that measures current is decreased by 1/40 times by using shunt resistance of 10Ω. Then, the value of the resistance of the galvanometer is