Q.

In a tangent galvanometer, a current of 0.1 A produces a deflection of 30o. The current required to produce a deflection of 60o is

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a

0.2 A

b

0.3 A

c

0.4 A

d

0.5 A

answer is B.

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Detailed Solution

i∝tanϕ⇒i1i2=tanϕ1tanϕ2⇒0.1i2=tan30otan60o=13⇒i2=0.3 A
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In a tangent galvanometer, a current of 0.1 A produces a deflection of 30o. The current required to produce a deflection of 60o is