If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:

The correct answer is option 4) i.e. repelled by both the poles.

CONCEPT:

• Diamagnetic substance: Diamagnetic substances are those that are capable of freely getting magnetized when placed in an external magnetic field.
  • ​The magnetization takes place in a direction that is opposite to the external magnetic field. 

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• When an external magnetic field is applied, the dipoles are induced in the diamagnetic materials arrange themselves in such a way that they start opposing the external magnetic field.
• The atoms of diamagnetic substances have paired electrons.
• A few examples of diamagnetic substances are Copper, Zinc, Bismuth, Silver, and Gold.

EXPLANATION:

• When a diamagnet is brought near a bar magnet it gets magnetized. The magnetization takes place in a direction that is opposite to the external magnetic field.
• When the diamagnet is at a distance from the bar magnet, the magnetic field deviates away from the diamagnet.

• When the diamagnet is brought more closer to the bar magnet, the magnetic field of the bar magnet has no space to deviate but acts as if the end of the diamagnet is a like pole and repels.

Hence, the diamagnet will get repelled by the poles of the bar magnet.