A coil of 50 turns and radius 10 is plac...

A coil of 50 turns and radius 10 is placed with its plant at right angles to the magnetic meridian. It is connected to a cell of steady emf and a rheostat. The current through the coil is gradually increased till a compass needle at its center just turns through `180^(@)`. Find the strength and direction of current through the coil.
(Horizontally intensity of earth's field = 30 A`m^(-1)`

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The correct Answer is:

0.12 A

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