You've decided to make a magnetic projectile launcher shown in the figure for your science project. An aluminum bar of l

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You've decided to make a magnetic projectile launcher shown in
the figure for your science project. An aluminum bar of
length l slides along metal rails through a magnetic
field B. The switch closes at t =0s, while the
bar is at rest, and a battery of EMFebat starts a current
flowing around the loop. The battery has internal
resistance r. The resistance of the rails and the bar are
effectively zero.
The bar reaches a terminal speed vterm. Find an expression
for vterm.?
Evaluate vterm for Ebat=5.0V , r=0.10Ω, l = 7 cm , and B =
0.40 T .