In which diagram(s) is/are the correct poles of the electromagnet indicated?
(N indicates North pole and S indicates south pole.)

Options

A. 2 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2 and 3

Answer

A

Explanation

The end of electromagnet (coil) where the current appears to flow clockwise, acts as south pole and vice-versa. Hence in the given winding, end connected to positive terminal of a battery will act as a south pole and other end as a north pole. Hence only diagram 2 is correct.