What causes the couple acting on the needle o | vedclass

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(A) compass needle is a small magnetic dipole. When placed in an external magnetic field (such as the Earth's magnetic field),the two poles of the nee

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The magnetic field of the Earth.

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(A) compass needle is a small magnetic dipole. When placed in an external magnetic field (such as the Earth's magnetic field),the two poles of the needle experience equal and opposite forces: $F = mB$ and $F = -mB$. Since these forces act at different points (the North and South poles of the needle),they constitute a couple. This couple exerts a torque on the needle,causing it to align with the magnetic field lines.

What causes the couple acting on the needle of a compass?

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