Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

Assertion: If one arm of a U-tube containing a diamagnetic solution is placed in between the poles of a strong magnet with the level in line with the field, the level of the solution falls.

Reason: Diamagnetic substances are repelled by the magnetic field.

In the light of the given statements, choose the correct answer from the options given.

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

When only one arm of the U tube is placed in the uniform magnetic field, the diamagnetic fluid gets repelled by the field and some fluid shifts to the other arm decreasing the level in the arm which is in the field.

Diamagnetic substances are repelled when placed in a uniform magnetic field because the applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force.

The repulsion due to the induced magnetic field causes the fluid to move to the other arm. Hence the reason is true and correctly explains the assertion.

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