Magnetic Moment and Uncharged Materials – Rankers Physics
Topic: Magnetic Effects of Current
Subtopic: Bar Magnet

Magnetic Moment and Uncharged Materials

Assertion (A): Magnetic field arises due to charge in motion but a system may have magnetic moment even though its net charge is zero.
Reason (R): Uncharged magnetic material may have dipole moment.
 
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution:

Magnetic fields are produced by moving charges. Atoms/molecules with electron motion have magnetic moments even if neutral. Uncharged materials like ferromagnets have atomic dipole moments. Reason (R) explains how uncharged materials can have dipole moments, thus supporting Assertion (A).

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