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Which material is considered as perfectly diamagnetic?

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Which material is considered as perfectly diamagnetic?

(a) Copper

(b) Gold

(c) Superconductor

(d) Water

I had been asked this question in an interview for internship.

My query is from Ferro, Para and Dia Magnetic Materials in division Magnetic & Insulating Materials of Engineering Material & Metallurgy

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The correct option is (c) Superconductor

Explanation: Superconductors are considered as perfect diamagnets due to their ability to eject magnetic force in all directions. This principle is based on the well known Meissner effect. Superconductors have a susceptibility of -1 * 10^5.

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