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Question 25: NCERT Solutions for 12th Class Physics: Chapter 5-Magnetism and Matter

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Question 25: NCERT Solutions for 12th Class Physics: Chapter 5-Magnetism and Matter

The magnetic moment vectors

and

associated with the intrinsic spin angular momentum

and orbital angular momentum

respectively, of an electron are predicted by quantum theory (and verified experimentally to a high accuracy) to be given by

=

and

=

Which of these relations is in accordance with the result expected classically? Outline the derivation of the classical result.

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  1. Solution:
    Out of the two relations given, only one is in accordance with classical physics. This is

    where r is the radius of the circular orbit, which the electron of mass m and charge (- e) completes in time T. Divide (i) by (ii),

    of quantum mechanics.

    Check the complete chapter with solutions.

    NCERT Solutions for 12th Class Physics: Chapter 5-Magnetism and Matter