A conducting bar of length l and mass m rests at the left end of the two frictio

Question

A conducting bar of length l and mass m rests at the left end of the two frictionless rails of length d in the figure(Figure 1) . A uniform magnetic field of strength B points upward.

A conducting bar of length l and mass m rests at the left end of the two frictionless rails of length d in the figure(Figure 1) . A uniform magnetic field of strength B points upward. Find an expression for the bar's speed as it leaves the rails at the right end. Express your answer in terms of the variables l, I, B, m,and d.

Explanation / Answer

F=ma=IBL

a=IBL/m

v^2-U^2=2as

so

v = sqrt(2IBL/md)

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