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Q.

A current of 4A produces a deflection of 30° in the galvanometer. The figure of merit is

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a

6.5 A/rad

b

7.6 A/rad

c

7.5 A/rad

d

8.0 A/rad

answer is B.

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Detailed Solution

k=Iθ=4(π6)=4×6×722=2×6×711=8411=7.6 A/rad
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A current of 4A produces a deflection of 30° in the galvanometer. The figure of merit is