Question

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

• A. the torsion of the silk fibre
• B. the horizontal component of earth's magnetic field
• C. the force of gravity
• D. all the above factors

Answer 1

Answer: (B)

Earth behaves as a magnet which will interact with the magnetic needle and makes it oscillate.