Question

With the aid of a labelled diagram ,describe an experiment t show that a magnetic field exists around a straight line.

Answer 1

Explanation:

The conductor is kept in N-S direction and its ends are connected to a battery rheostat and a tapping key. When the key is open i.e. no current flows in the conductor the needle points in N-S direction. As the key is pressed and a current passes in the conductor the needle deflects. This shows that a magnetic field Exists around a current carrying conductor.