A conductor bar with mass m and length L slides over horizontal rails that are connected to a voltage source. The voltage source maintains a constant current I in the rails and bar, and constant, uniform, vertical magnetic field `vecB` fills the region between the rails (as shown in Fig.)

Find the magnitude and direction of the net force on the conducting bar. Ignore friction, air resistance and electrical resistance.

Options

A. ILB, to the right.
B. ILB, to the left.
C. 2ILB, to the right.
D. 2ILB, to the left.

Answer

a

Explanation

`F=ILB`, to the right.
`v^2=2ad implies d=(v^2)/(2a)=(v^2m)/(2ILB)`