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In the accompanying figure, the rails, connecting end
piece, and rod all have a resistance per unit length of
2.0 2/cm. The rod moves to the left at v = 3.0 m/s. If
B = 0.75T everywhere in the region, what is the current
in the circuit (a) when a = 8.0cm? (b) when
a = 5.0 cm? Specify also the sense of the current flow.
4.0 cm

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