A metal rod of length L moves with velocity v, perpendicular to its length, in a magnetic field B, which is perpendicular to both the rod and its velocity. If the length of the rod is doubled, what happens to the electric field in the rod?
A) It stays the same.
B) It doubles.
C) It quadruples.
D) It halves.
E) It quarters.

Question

Quizplus · Accepted Answer

The electric field in the rod is proportional to the velocity and the magnetic field, but not affected by the length of the rod. Therefore, if the length is doubled, the electric field remains the same.

A Metal Rod of Length L Moves with Velocity V