Comprehension Passage
Figure shows a metal rod PQ resting on the rails AB and positioned between the poles of a permanent magnet. The rails, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 180.0 mΩ. Assume the field to be uniform.
Suppose K is open and the rod is moved with a speed of 12 cms-1 in the direction. The magnitude of the induced emf will be:
1
4.5 × 10-3 V
2
9.0 × 10-3 V
3
18.0 × 10-3 V
4
27.0 × 10-3 V