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(B) The coil is placed in the $N-S$ vertical plane. According to the right-hand thumb rule,for a clockwise current,the magnetic field produced by the

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West-north direction

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(B) The coil is placed in the $N-S$ vertical plane. According to the right-hand thumb rule,for a clockwise current,the magnetic field produced by the coil at its center is directed from East to West.Earth's horizontal magnetic field is directed from South to North.The magnetic needle aligns itself along the direction of the resultant magnetic field.The resultant vector is the vector sum of the coil's magnetic field (pointing West) and the Earth's magnetic field (pointing North).Therefore,the north pole of the magnetic needle will point in the West-North direction.

$A$ coil carrying a heavy current and having a large number of turns is mounted in a $N-S$ vertical plane,and a current flows in a clockwise direction. $A$ small magnetic needle at its center will have its north pole in:

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