As Shown in the Figure, One End of a Metal

Multiple Choice

As shown in the figure, one end of a metal bar is in contact with a circular rail and the other end is pivoted at P. A steady uniform, magnetic field B into the page is present. As the bar rotates about point P in a clockwise direction, the direction of the induced current through the resistor R is

A) from a to b.
B) from b to a.
C) No current is induced.