Question

Magnetic moment of the spinning electron is in the direction of its spin angular momentum.

• A. Spin angular momentum
• B. Spin Velocity
• C. Spin angular velocity
• D. angular acceleration

Answer 1

The correct option is A Spin angular momentum

The magnetic moment is given as $M=i\pi R^2$, which has the direction normal to it's plane of motion, and direction of current decides the upward and downward direction of the magnetic moment.

Similarly spinning angular momentum is also perpendicular to plane of motion, it's direction is decided by it's velocity, which is opposite to the direction of current.