Question

The question Statement $I$ (Assertion) and Statement $II$ (Reason). The question has $4$ choices (a), (b), (c) and (d) out of which ONLY ONE is correct. So, select the correct choice.
Choices are
Statement $I$: Magnetic field lines are closed curves.
Statement $II$: Magnetic monopoles can't exist.

• 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 A

Statement $I$ is True, Statement $II$ is True; Statement $II$ is a correct explanation for Statement $I$

Explanation for Assertion statement:

Magnetic field lines are closed curves that emerge from the North pole of the magnet and enter the South pole, i.e. field lines outside the magnet run north to south, and field lines inside the magnet go south to north.

Explanation for Reason statement:

1. There is no such thing as a magnetic monopole.
2. Even if a magnet is broken down to its atomic level, the magnetic North pole and South pole cannot be physically separated, much as the two faces of a current loop cannot be physically separated.

Statement $I$ is True, Statement $II$ is True; Statement $II$ is a correct explanation for Statement $I$.

Hence, option (a) is correct.