A) گردشی حرکی توانائی
B) جَڑتا کا موڑ
C) زاویائی سمتار
D) زاویائی معیارِ حرکت
درست جواب: D
$ {\tau _{ex}}=0 $
$ \text{So,}\frac{dL}{dt}\text{=0} $
یعنی L = مستقل لہٰذا زاویائی معیارِ حرکت مستقل رہتا ہے۔
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