? long vertical wire carries a steady 70 A current. A pair of rails are horizont

Question

? long vertical wire carries a steady 70 A current. A pair of rails are horizontal and are 0.20 m apart. A 20 ohm resistor connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a constant velocity of 0.90 m/s, as shown. The bar and the rails have negligible resistance. At a given instant t1, the bar is 0.20 m from the wire, as shown. In Figure 21.3, at time t1, the induced current and its direction through the resistor are closest to:

Explanation / Answer

e = d(phi)/dt = Uo*I/(2pi*r)*L *v

I = e/20 = 6.3 microA

hence answer = A

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