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Assertion The angular momentum of system...

Assertion The angular momentum of system always remain constant.
Reason For a system, `tau_(ext)=(dL)/(dt)=0`

A

Both A and R are correct and R is the correct explanation of A

B

Both A and R are true but R Is not the correct explanation of A

C

A Is correct but R Is Incorrect

D

Both A and R are Incorrect

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