The loop shown moves with a velocity v in a uniform magnetic field...

The loop shown moves with a velocity $v$ in a uniform magnetic field of magnitude $B$, directed into the paper as shown in the figure. The potential difference between points $P$ and $Q$ is $e$. Then
(a) (e=\frac{1}{2} B L v) (b) $e=B L v$ (c) P is positive with respect to Q (d) Q is positive with respect to P