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Question

Assertion (A) : Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.

Reason (R) : A charged particle at rest produces a magnetic field.

A
Both (A) and (R) are true, (R) is the correct explanation of (A)
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B
Both (A) and (R) are true, (R) is not the correct explanation of (A)
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C
(A) is true but (R) is false.
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D
(A) is false but (R) is true.
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Solution

The correct option is C (A) is true but (R) is false.
As we know, current loop has magnetic moment, here the moving electrons behaves as current loops. Thus, the magnetic moment associated with electron motion is,

μ=IA=q(v2πr)×πr2=evr2 [q=e]

L=mvr vr=Lm

μ=eL2m

It is also possible that, magnetic moment due to spin motion of electrons.

But a charged particle at rest will not produce the magnetic field. It will only produce electric field.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (C) is the correct answer.

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