Physics
In the presence of earth's magnetic field, a compass needle rests in …………… direction.
- north-west
- north-east
- north-south
- east-west
Electro-Magnetism
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Answer
north-south
Reason — The Earth's magnetic field aligns roughly with the geographic north-south axis. Therefore, when a compass needle is influenced by the Earth's magnetic field, it aligns itself with the magnetic field lines, pointing towards the Earth's magnetic north pole, which is approximately aligned with the geographic north pole. This causes the north end of the compass needle to point towards the geographic north pole, and the south end to point towards the geographic south pole, resulting in the needle resting in the north-south direction.
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