-In the figure,a bar is in contact with a pair of parallel rails.A steady,uniform,magnetic field,perpendicular to the plane of the rails,is present.The bar is in motion with velocity ν.The induced current through the resistor R is:
A)zero
B)from a to b
C)from b to a

Question

-In the figure,a bar is in contact with a pair of parallel rails.A steady,uniform,magnetic field,perpendicular to the plane of the rails,is present.The bar is in motion with velocity ν.The induced current through the resistor R is:
A)zero 
B)from a to b 
C)from b to a

Quizplus · Accepted Answer

The induced current will be from a to b because the magnetic field is perpendicular to the plane of the rails and the bar is in motion with velocity v. This will cause a magnetic force on the bar, which will cause it to move in a circular path. The induced current will be in the direction that opposes the motion of the bar.

-In the Figure,a Bar Is in Contact with a Pair