Assertion: Magnetic moment of an atoms is due to both, the orbital motion and spin motion of every electron.
Reason: A charged partical produces a magnetic field.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion and reason both are false.

Answer

C

Explanation

In an atom, electrons revolve around the nucleus and as such the circular orbit of electrons may be considered as the small current loops. In addition to orbital motion, an electron has got spin motion also. So the total magnetic moment of electron is the vector sum of its magnetic moment due to orbital and spin motion. Charge particles at rest do not produce electric field.