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How is magnetic moment determined?

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How is magnetic moment determined?

(a) Planck unit

(b) Bohr magneton

(c) Eddington number

(d) Sommerfield number

I got this question in a national level competition.

The doubt is from Ferro, Para and Dia Magnetic Materials in section Magnetic & Insulating Materials of Engineering Material & Metallurgy

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Correct option is (b) Bohr magneton

To explain: The magnetic moment is the amount of torque produced in a magnetic field. This is expressed in terms of the constant known as Bohr magneton.

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