AIIMS 2018 Physics Magnetic Field Due to Current Assertion Reason Question

The assertion is false because the magnetic field at the center of a current-carrying circular loop is not zero; instead, it is given by the formula $B = \frac{\mu_0 n I}{2R}$, where $\mu_0$ is the permeability of free space, $n$ is the number of turns per unit length, $I$ is the current, and $R$ is the radius of the loop. The reason is true as it correctly states the formula for the magnetic field at the center of the loop, but since the assertion is false, option A cannot be correct. Options B and C are incorrect because they rely on the assertion being true, while option D is incorrect as it incorrectly claims both statements are false.