The magnetic needle of a tangent galvanometer is deflected at an angle 30o.The horizontal component of earth's magnetic field 0.34 x 10-4 T is along the plane of the coil. The magnetic induction produced by the coil at its center is

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1.96 x 10-4 T

1.96 x 10-5 T

1.96 x 104 T

1.96 x 105 T

answer is B.

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Detailed Solution

B=BHtanθ=0.34 x 10-4 tan30o=1.96 x 10-5 T;where tan300 = 13

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