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Q.

The sensitivity of a galvanometer is 60 divisions/ Amp. When a shunt is used, its sensitivity becomes 10 divisions/amp. If galvanometer is of resistance 20 Ω , the value of shunt used is :

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a

2Ω

b

20Ω

c

4Ω

d

5Ω

answer is A.

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Detailed Solution

$\frac{10}{60} = \frac{S}{G + S}$
6S = G + S $\Rightarrow$ 6S = 20 + S $\Rightarrow$ S = 4Ω

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The sensitivity of a galvanometer is 60 divisions/ Amp. When a shunt is used, its sensitivity becomes 10 divisions/amp. If galvanometer is of resistance 20 Ω , the value of shunt used is :