If a diamagnetic substance is brought near north or south pole of a bar magnet, it is
Correct answer: B. Repelled by the poles
- A. Attracted by the poles
- B. Repelled by the poles
- C. Repelled by the north-pole and attracted by the south pole
- D. Attracted by the north pole and repelled by the south pole
Explanation
Diamagnetic substances are characterised by their ability to create a weak magnetic field in opposition to an externally applied magnetic field. As a result, when a diamagnetic substance is brought near either pole of a magnet, it is repelled. This is because the induced magnetic moment in the diamagnetic material is oriented in the opposite direction to the magnetic field of the bar magnet. Therefore, the correct answer is that a diamagnetic substance is repelled by the poles. Options A, C, and D describe behaviours that are not typical of diamagnetic materials: Option A describes attraction, which occurs with ferromagnetic and paramagnetic substances; Option C describes a mixed response, which is incorrect; and Option D also describes a behaviour not exhibited by diamagnetic materials.
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