In figure a long straight wire carries a steady current I. A conducting rod is in contact with a pair of rails, and rotates about the straight wire. The induced current in the resistor R is
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a
from a to b
b
from b to a
c
zero
d
can’t be decided
answer is C.
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Detailed Solution
The velocity of every element of conducting rod is parallel to magnetic field. Therefore motional emf is zero.