A) ঘূর্ণন গতিশক্তি
B) জড়তার ভ্রামক
C) কৌণিক বেগ
D) কৌণিক ভরবেগ
সঠিক উত্তর: D
$ {\tau _{ex}}=0 $
$ \text{So,}\frac{dL}{dt}\text{=0} $
অর্থাৎ L = ধ্রুবক। সুতরাং কৌণিক ভরবেগ স্থির থাকে।
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