Question
Physics Question on Magnetism and matter
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
the horizontal component of earth?s magnetic field
Explanation
Solution
The restoring torque is due to horizontal component of earth?s field.