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प्रश्न
What is a compass needle?
विकल्प
A magnetic field line near Earth's surface
A small magnet mounted so that it can rotate freely
An isolated magnetic north pole
A bar magnet fixed so that it cannot rotate
MCQ
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उत्तर
A compass needle is a small magnet mounted so that it can rotate freely. This freedom of movement lets it align with Earth's magnetic field.
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