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Question

The magnetic needle of a tangent galvanometer is deflected at an angle 30 due to a magnet. The horizontal component of the earth's magnetic field0.34×10-4T is along the plane of the coil. The magnetic intensity is:


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Solution

Step 1: Given data,

Angle of deflection =30

The horizontal component of the magnetic field BH=0.34×10-4T

Step 2: Solve for the magnetic intensity.

The magnetic intensity is BHtanθ

=0.34×10-4×tan30=0.34×10-4×0.577=1.96×10-5T

Thus, the magnetic intensity is 1.96×10-5T


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