The two conducting rails in the drawing are tilted upwards so they make an angle of 30.0° with respect to the ground. The vertical magnetic field has a magnitude of 0.053 T. The 0.18 kg aluminum rod (length = 1.6 m) slides without friction down the rails at a constant velocity.

How much current flows through the bar?

A?

heres a similiar formula, couldn't I manipulate that formula to solve for A?

http://img340.imageshack.us/img340/383/22481052tg6.png