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Q6.14 (c) 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 mutually 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. With K open and the rod moving uniformly, there is no net force on the electrons in the rod
even though they do experience magnetic force due to the motion of the rod. Explain?
Answers (1)
When the rod starts to move in the magnetic field, excess change is developed at the ends of the rod which develops an electric force. This force cancels the magnetic force on the electron, thus the net force on the electrons is zero.
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