The current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of $90^{o}$ in the anticlockwise sense looking from above. Predict the direction of the needle. Take the magnetic declination at the places to be zero.

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Solution

When the current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of $90^{\circ}$ , the needle will reverse its original direction.

Thus, the needle will point from east to west direction.

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A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of 30 turns and radius 12 cm. The coil is in a vertical plane making an angle of 45º with the magnetic meridian. When the current in the coil is 0.35 A, the needle points west to east.

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