Question

A metal road moves at a constant velocity in a direction perpendicular to its length & a constant uniform magnetic field too. Select the correct statement (s) from the following.

(a) The entire rod is at the same electrical potential 

(b) There is an electric field in the rod 

(c) The electric potential is highest at the centre of the rod. 

(d) The electric potential is lowest at the centre of the rod.

Answer 1

The correct option (b) There is an electric field in the rod

Explanation:

Let metal rod AB moves Parallel to X axis. Let the uniform magnetic field point in positive z direction. The free electrons of metal rod will experience magnetic force towards B.

∴ There will be excess e in B end and shortage of electrons on end A.

Hence end B is negative changed & A is positive charged.

Hence field is set up in the rod.