Q: A particle undergoes uniform circular motion. About which point on the plane of the circle, will the angular momentum of the particle remain conserved ?
(a)Centre of circle
(b)On the circumference of the circle
(c)Inside the circle
(d)Outside the circle
Sol: In a uniform circular motion , the force acting on the particle is centripetal force , which is acting towards the centre.
Torque of this force about the centre is zero . hence angular momentum about the centre remain conserved.