For of particles under central forcer field, the total angular momentum is conserved.
The torque acting on such a system is zero.

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 both assertion and reason are false

Answer

A

Explanation

When external torque acting on the system is zero then only the total angular momentum of system is considered to be conserved.
If `vecL=I omega=" constant, "tau=//alpha =0.`
`because alpha=(d omega)/(dt)=0" for constant "omega.`