Question

At the situations will the total angular momentum of a system remain constant? A) No net force acting on the system. B) No net external torque acting on the system. C) No energy transfer across the boundary of the system. D) Cannot be determined.

Answer 1

Answer:

No net external torque acting on the system.

Explanation:

The law of conservation of angular momentum defines that "in an isolated system, the total angular momentum of a system remain constant if no net external torque acting on the system". The mathematical description is given by :

In an isolated system,

$\tau=\dfrac{dL}{dt}$

$\dfrac{dL}{dt}=0$

So, L = constant

So, the correct option is (B).