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Find the true statement. (a)Most of the substances show ferromagnetism

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Find the true statement.

(a) Most of the substances show ferromagnetism

(b) The magnetic susceptibility of diamagnetic substances are temperature independent

(c) Water is paramagnetic in nature

(d) Typical domain size of a ferromagnetic material is 1 nm

I got this question in a job interview.

I'm obligated to ask this question of Permanent Magnets and Electromagnets in chapter Magnetism and Matter of Physics – Class 12

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Correct answer is (b) The magnetic susceptibility of diamagnetic substances are temperature independent

For explanation: The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.

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