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Which of the following is a diamagnetic material?

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Which of the following is a diamagnetic material?

(a) Sodium

(b) Calcium

(c) Oxygen (at STP)

(d) Nitrogen (at STP)

The question was asked in an interview.

This intriguing question comes from Classification of Magnetic Materials topic in chapter Magnetic Properties of Materials of Engineering Physics II

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The correct option is (d) Nitrogen (at STP)

Explanation: Nitrogen (at STP) is a diamagnetic material. Sodium, Calcium and Oxygen (at STP) are paramagnetic in nature.

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