A tangent galvanometer has a coil of 25 turns and radius of 15 cm. The horizontal component of the earth's magnetic field is 3 x 10-5 T. The current required to produce a deflection of 45o is

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0.29 A

1.2 A

3.6 x 10-5 A

0.14 A

answer is A.

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Detailed Solution

i =2RBHμ0Ntanθ⇒i=2 x 15 x 10-2 x 3 x 10-54π x 10-7 x 25 x tan45o⇒i=0.29 A

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