A small mass m is attached to a massless string whose other end is fixed at P as shown in figure. The mass is undergoing circular motion in x-y plane with centre O and constant angular speed 
. If the angular momentum of the system, calculated about O and P and denoted by 
and 
respectively, then
and 
do not vary with time.
varies with time while 
remains constant.
remains constant while 
varies with time.
and 
both vary with time.
Text Solution
Verified by ExpertsC
In figure, weight mg of the mass acts vertically downwards and tension T in the string acts along KP. Two rectangular components of T are 
opposite to mg and 
along KO.
About O, torques due to T 
and mg cancel out. Torque due to 
is zero. Therefore, net torque about O is zero.
As 
is not central force is zero
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