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vecF = a hat i + 3hat j+ 6 hat k and vec...

`vecF = a hat i + 3hat j+ 6 hat k` and `vec r = 2hat i-6hat j -12 hat k`. The value of `a` for which the angular momentum is conserved is

A

-1

B

2

C

zero

D

1

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The correct Answer is:
A
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