A Copper Wire is Held Between the Poles of a Magnet. The Current in the Wire Can Be Reversed.

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?

A. 1
B. 2
C. 3
D. 4

Correct answer is option B. 2. Explanation: Either North or South of the four directions the force act on the wire.