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A circuit coil of radius 20 cm and 20 tu...

A circuit coil of radius 20 cm and 20 turns of wire is mounted vertically withits plane in the magnetic meridian. A small magnetic needle placed at the center of the coil is deflected through `45^(@)` when a current is passed through the coil. What is the value of the current? (horizontal induction of earth's field = `3.6x 10^(-5)Wb//m^(2)`

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The correct Answer is:
0.54 A
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SL ARORA-MAGNETISM-Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet
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