A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle togather with the cork move towards the north of the lake

Options

A. Yes
B. No
C. May be or may not be move
D. Nothing can be said

Answer

B

Explanation

Magnetic needle is dipole which is earth's uniform magnetic field and as a dipole in a uniform field does does not experience any net force but may experience a couple as shown in figure, so the needle togather with the crok will not translate i.e., move towards the north of the lake, but will ratate and set itself parallel to the field with its north pole pointing north.