Question

The question Statement $I$ (Assertion) and Statement $II$ (Reason). The question has choices (a), (b), (c) and (d) out of which ONLY ONE is correct. So, select the correct choice.

Statement $I$: A current carrying conductor at rest in a magnetic field always experiences a zero force (magnetic).

Statement $II$: Magnetic force experienced by a stationary charged particle in magnetic field is zero.

• A. Statement $I$ is True, Statement $II$ is True; Statement $II$ is a correct explanation for Statement $I$
• B. Statement $I$ is True, Statement $II$ is True; Statement $II$ is NOT a correct explanation for Statement $I$
• C. Statement $I$ is True, Statement $II$ is False
• D. Statement $I$ is False, Statement $II$ is True

Answer 1

The correct option is D

Statement $I$ is False, Statement $II$ is True

Explanation for Assertion statement:

1. Free electrons move with a drift velocity in a current carrying conductor and experience magnetic force, but positive ions are static and do not feel magnetic force.
2. So, the magnetic force is not zero here.

Explanation for Reason statement:

1. $F=qvB$ describes the force felt by a particle carrying the charge $+q$ and moving with a velocity $v$ in a magnetic field with its velocity perpendicular to the field.
2. If $v=0$, then $F=0$, implying that a stationary charged particle in a magnetic field experiences no force.

Statement $I$ is False, Statement $II$ is True.

Hence, option (d) is correct.