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Q.

A galvanometer is used in laboratory for detecting the null point in electrical experiments. If, on passing a current of 6 mA it produces a deflection of 2º, its figure of merit is close to :

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a

333º A/div

b

3×10−3 A/div

c

6×10−3 A/div

d

666º A/div

answer is B.

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Detailed Solution

Figure of merit of a galvanometer = reciprocal of current sensitivity 

=6mA2°=3×10−3A/degree

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