Two identical conductors P and Q are placed on two frictionless rails R and S in a uniform magnetic field directed into the plane. If P is moved in the direction shown in figure with a constant speed, then rod Q

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will be attracted toward P

will be repelled away from P

may be repelled away or attracted toward P

will remain stationary

answer is A.

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Detailed Solution

From Lenz's law if one rod is moved away from the second rod then the second rod will be attracted towards the first rod so as
to oppose the change in flux.

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