Question

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement(s) from the following:

• A. The entire rod is at the same electric potential
• B. There is an electric field in the rod
• C. The electric potential is highest at the center of the rod and decrease toward its ends
• D. The electric potential is lowest at the center of the rod and increases toward its ends

Answer 1

The correct option is B There is an electric field in the rod

$E=l.(\overrightarrow{v}\times \overrightarrow{B})$
Since the velocity, magnetic field and lenght are all perpendicular, $E=BvL$