A conducting bar of length 0.3 m can move without friction on a pair of conducti

Question

A conducting bar of length 0.3 m can move without friction on a pair of conducting rails. The rails are joined at the left by a battery of emf 3.00 V, and a switch that is initially open. The bar, initially at rest, has a resistance 9.00 Omega (resistance of all other parts of the circuit is negligible). The whole apparatus is in a uniform magnetic field of magnitude 0.100 T directed into the page. Both the rails and the magnetic field extend far to the left and right. What the the magnitude of the net force on the bar immediately after the switch is closed? Please provide a solution/explanation. The correct answer is 0.01 N, so please answer only if you know how to obtain this value.

Explanation / Answer

F= l v (B/r)

0.3*3/ 9 *0.1

=0.01

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