Magnetic Moment and Net Charge – Rankers Physics
Topic: Magnetic Effects of Current
Subtopic: Magnetic Field Due to Straight Current Carrying Wire

Magnetic Moment and Net Charge

Assertion (A): A system can not have magnetic moment when its net charge is zero.
Reason (R): Magnetic field arises due to charge in motion.
 
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:

Assertion (A) is false. A current loop, for instance, has zero net charge but possesses a magnetic moment. Reason (R) is true; magnetic fields are indeed generated by moving charges (currents). Since Assertion (A) is false, options A, B, and C are incorrect. Option D states both (A) and (R) are false, which is partially incorrect as (R) is true. However, being the only option where (A) is stated as false, we choose it.

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