Question

A particle is moving in a horizontal uniform circular motion. The angular momentum of the particle is conserved about

• A. centre of the circle
• B. outside the circle
• C. inside the circle
• D. any point on circumference

Answer 1

The correct option is A centre of the circle

The net force acting on a particle undergoing uniform circular motion is centripetal force which always passes through the centre of the circle.
The torque due to this force about the centre is zero, therefore, $\overrightarrow{L}$ is conserved about $O$.