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Get Answers to all your Questions
Q6.14 (d)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.
(d) What is the retarding force on the rod when K is closed?
Answers (1)
Induced emf = 9mV (calculated in a part of this question)
The resistance of loop with rod = 9
Induced Current
Now,'
Force on the rod
Hence retarding force when k is closed is .
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