A Conducting Bar of Length L Rotates in a Counterclockwise

A conducting bar of length L rotates in a counterclockwise direction 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_B?

A) +24 mV
B) −24 mV
C) +16 mV
D) −16 mV
E) +32 mV