Q. The angular momentum of a particle is conserved when:

किसी कण का कोणीय संवेग तब संरक्षित होता है जब:

No external torque acts
कोई बाहरी बलाघूर्ण कार्य नहीं करता

No external force acts
कोई बाहरी ताकत काम नहीं करती

It moves in a circle
यह एक वृत्त में घूमता है

Its velocity is constant
इसका वेग स्थिर है

Angular momentum is conserved in a system only if the net external torque is zero:

\frac{d L}{d t} = τ_{ext} \Rightarrow τ_{ext} = 0 \Rightarrow L = constant

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