As Shown in the Figure, One End of a Metal $\mathrm { P }$

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 $\mathrm { P }$ . 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.