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Q.

In a moving coil galvanometer, a coil of area 5 cm2 having 100 turns carrying a current of 0.5×104 amp is suspended in a magnetic field of induction 0.2 T. deflects through an angle of 200. The couple per unit twist is

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a

2.5×105Nm/degree

b

5×105Nm/degree

c

2.5×108Nm/degree

d

5×108Nm/degree

answer is B.

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Detailed Solution

Cθ=BiNA 

C=NiABθ

C=5×10-4×100×0.5×10-4×0.220

C=2.5×10-8

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