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A circular coil of radius 20 cm and 20 t...

A circular coil of radius `20 cm` and `20` turns of wire is mounted vertically with its plane in magnetic meridian.A small magnetic needle (free to rotate about vertical axis) is placed at the center of the coil.It is deflected through `45^(@)` when a current is passed through the coil and in equilbrium (Horizontal component of earth's field is `0.34 xx 10^(-4) T`).The current in coil is:

A

`17/(10pi)A`

B

`6A`

C

`6xx10^(-3)A`

D

`3/50A`

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The correct Answer is:
A
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RESONANCE-ELECTRODYNAMICS-Exercise-1 PART-2
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