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Figure shows a metal rod PQ resting on the smooth rail AB and positioned between the poles of a permanent magnet. The rail, 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 = $9.0 m \Omega$. Assume the field to be uniform.
What is the induced emf in the moving rod if the magnetic field is parallel to the rails instead of being perpendicular?

(a) maximum
(b) minimum
(c) zero
(d) cannot be determined

1 Answer

When the field is parallel to length of rails $\theta = 0^{\circ}$
Induced emf $= e =Bvl \sin \theta = 0$
The moving rod will not cut the field lines so the charge in flux is zero. Therefore the induced emf is zero.
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