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

Quizplus · Accepted Answer

The bar moves perpendicular to the magnetic field, so an emf is induced in it. The direction of the induced current is such that it opposes the motion of the bar. The resistor R is in the circuit, so the current flows through it.

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