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यदि कण तंत्र पर बाह्य बल-आघूर्णो का मान शून्य होता है तो क्या ऐसा संभव है कि उसके विभिन्न कणों के कोणीय संवेग परिवर्तित हो रहे हों लेकिन उनका सदिश योग परिवर्तित न हो?

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हाँ

\(\therefore \tau= \frac{dL}{dt}\) से

यदि  r = 0

\(\therefore \ L =\)नियत तो [ L1 + L2 .........= नियत ]

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