A Conducting Bar of Length L Rotates with a Constant

A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end,as shown.A uniform magnetic field (magnitude = 0.20 T) is directed into the paper.If L = 0.40 m,what is the potential difference,V_A − V_P?

A) −12 mV
B) +8.0 mV
C) −8.0 mV
D) +12 mV
E) −16 mV