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Q.

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.
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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