---
title: "When is the angular momentum of a system constant?"
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date_modified: "2025-12-14T04:13:02+00:00"
---

# When is the angular momentum of a system constant?

When is the angular momentum of a system constant?

- **A.** Only when the linear momentum and the energy are constant.
- **B.** It’s always conserved in an open system.
- **C.** Only when its total kinetic energy is constant.
- **D.** Only when no net external torques acts on the system.
- **E.** Only when the moment of inertia is constant.

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