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A magnetic needle free to rotate in a horizontal plane is placed at the centre of a circular current-carrying coil whose axis is perpendicular to the magnetic meridian at that place. It is also known that the magnetic declination at this place is zero and in this condition, the magnetic needle is pointing towards the north-west. Now, if we reverse the direction of current in the coil, then the magnetic needle will
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The correct answer is:
point north-east
If there is no current in the coil, then the needle would point north but due to the magnetic field of the coil, it is pointing north-west. This means the magnetic field due to the coil is towards west and it is equal to the horizontal component of earth's magnetic field. So when we reverse the direction of current the magnetic field due to the coil will be towards east and the magnetic needle will point north-east.
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