-In the figure,one end of a bar is in contact with a circular rail and the other end is pivoted at P.A steady,uniform,magnetic field B is present.The bar rotates about P.The induced current through the resistor R is:
A)zero
B)from a to b
C)from b to a

Question

-In the figure,one end of a bar is in contact with a circular rail and the other end is pivoted at P.A steady,uniform,magnetic field B is present.The bar rotates about P.The induced current through the resistor R is:
A)zero 
B)from a to b 
C)from b to a

Quizplus · Accepted Answer

The rotation of the bar in the magnetic field induces an electromotive force (EMF) due to the change in magnetic flux, causing a current to flow from b to a through the resistor R.

-In the Figure,one End of a Bar Is in Contact