Suppose the 19Ω resistor of the previous problem is disconnected. Find the current through P2Q2 in the two situations.

(a) and (b) of that problem.


(a) When the 19Ω resistor is removed and the wires in move in the same direction, their polarity remains the same. Hence, the circuit remains incomplete and the current through P2Q2 is 0. (Ans)


(b) When the wires slide in opposite directions, the polarity of one of the wires reverses and current flows.


In this case, emf , where B = magnetic field, l = length, v = velocity.


Hence, V =


But here, resistance R = 2 Ω only


Therefore, Current flowing through the wire = 10-3 A (Ans)


1