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Q6.14 (g) Figure 6.20 shows a metal rod resting on the smooth rails
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
connects the rails through a switch
. Length of the
,
, resistance of the closed loop containing the
. Assume the field to be uniform. Suppose K is open and the rod is moved with a speed of
in the direction shown. Give the polarity and magnitude of the induced emf
(g) What is the induced emf in the moving rod if the magnetic field is parallel to the rails instead of being perpendicular?
Answers (1)
If the magnetic field is parallel to the rail then, the motion of the rod will not cut across the magnetic field lines and hence no emf will induce. Hence emf induced is zero in this case.
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