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Q.

Suppose a small cylinder of a paramagnetic substance and a small cylinder of a diamagnetic substance are placed between the (parallel) pole pieces of a strong magnet, so that they are aligned along the direction of the field lines. Will they attract or repel each other?

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a

Repel when they are placed such that their axis is common and attract when they are placed side by side.

b

Attract when they are placed such that their axis is common as well as when they are placed side by side.

c

Attract when they are placed such that their axis is common and repel when they are placed side by side.

d

Repel when they are placed such that their axis is common as well as when they are placed side by side.

answer is B.

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Detailed Solution

Diamagnetic materials create an induced magnetic field in a direction opposite to an externally applied magnetic field.

Paramagnetic materials create an induced magnetic field in a direction parallel to an externally applied magnetic field.

So, these two cylinders will repel when they are placed such that their axis is common and attract when they are placed side by side.

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