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A magnetic needle, suspended horizontally by an unspurn silk fibre, oscillates in the horizontal plane, because of a restoring force originating mainly from

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the horizontal component of earths’ magnetic field

all of the above

the torsion of the silk fibre

the force of gravity

answer is C.

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Detailed Solution

As there is an magnetic field on the surface of earth, when a magnetic needle is placed in air, there will be a torque acting on the needle in order to get the needle in to a stable position.

The stable position of the magnetic needle will be aligning its magnetic moment along the magnetic field of the earth.

And this will be the restoring force acting on the needle.

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