A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 mT magnetic field is perpendicular to both the rod and its velocity. If the resistance of the rod is 15 mΩ, what is the current in the rod?
A) 0.0 A
B) 1.0 A
C) 2.0 A
D) 4.0 A
E) 8.0 A

Question

Quizplus · Accepted Answer

The magnetic force experienced by the rod can be calculated using the formula F = BIL, where B is the magnetic field, I is the current, and L is the length of the rod. Since the velocity of the rod is perpendicular to the magnetic field and the rod, there is no force on the rod. Therefore, the current in the rod is zero.

A Metal Rod of Length 2