The magnetic needle of a tangent galvanometer is deflected at an angle 3 0 ∘ due to a magnet. The horizontal component of earth's magnetic field 0.34 × 1 0 − 4 T is along the plane of the coil. T

Question

The magnetic needle of a tangent galvanometer is deflected at an angle 3 0 ∘ due to a magnet. The horizontal component of earth's magnetic field 0.34 × 1 0 − 4 T is along the plane of the coil. The magnetic intensity is

TestHub · Accepted Answer

Angle through which magnet is deflected ( θ ) = 3 0 ∘ and horizontal magnetic field ( B H ​ ) = 0.34 × 1 0 − 4 T . Magnetic intensity = B H ​ tan θ = 0.34 × 1 0 − 4 × tan 3 0 ∘ = ( 0.34 × 1 0 − 4 ) × 0.577 = 1.96 × 1 0 − 5 T .

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