A copper wire is held between the poles of a magnet.\ The current in the wire can be reversed. The

Question

A copper wire is held between the poles of a magnet.\ The current in the wire can be reversed. The pole of the magnet can also be changed over. In how many of the four directions shown can the force act on the wire?\

Professor PC Thomas Classes · Answer

(b) : 2 (From Fleming's left hand rule, the force acting on the wire would be, either in north direction or in south direction).