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PART - 1 CH - 6 System of Particles and Rotational Motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsPART - 1 CH - 6 System of Particles and Rotational Motion1 Mark
Question
If the value of external forces and moments on a particle system is zero, then is it possible that the angular momentum of its various particles is changing but their vector sum does not change?
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Answer

 Yes $\because \tau=\frac{d L}{d t}$
If $\tau=0 \therefore L=$ constant then $\left[ L _1+ L _2+\ldots \ldots=\right.$ constant $]$

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