When is the angular momentum of a system constant?
A) Only when the linear momentum and the energy are constant.
B) Only when no net external torque acts on the system.
C) Only when its total kinetic energy is constant.
D) Only when no net external force acts on the system.
E) Only when the moment of inertia is constant.

Question

Quizplus · Accepted Answer

Angular momentum of a system remains constant (is conserved) only when no net external torque acts on the system. This is a direct consequence of the conservation of angular momentum, which is independent of the conservation of linear momentum, energy, or the constancy of the system's moment of inertia.

When Is the Angular Momentum of a System Constant