Suppose that a wire leads into another, thinner wire of the same material that has only a third the cross-sectional area. In the steady state, the number of electrons per second flowing through the...

Suppose that a wire leads into another, thinner wire of the same material that has only a third the cross-sectional area. In the

steady state, the number of electrons per second flowing through the thick wire must be equal to the number of electrons

per second flowing through the thin wire. If the drift speed in the thick wire is 4 × 10−5 m/s, what is the drift speed

in the thinner wire?