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Get Answers to all your Questions
Q6.14(b) 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. Is there an excess charge built up at the ends of the rods when
is open? What if
is closed?
Answers (1)
When key K is open, a charge is developed at the ends of the rods and on closing the key, this charge flows in the form of a current. Therefore, yes, the excess charge is maintained due to the continuous flow of the current in the circuit on closing key K.
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