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 towards P

will remain stationary

will be repelled away from P

may be repelled or attracted towards P

answer is A.

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Detailed Solution

According to lenz’s law induced emf opposes the causes of induction. Hence ‘Q’ should move in such away that area decreases. So ‘P’ attracts ‘Q’

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