A force vecF=alphahati+3hatj+6hatk is ac...

A force `vecF=alphahati+3hatj+6hatk` is acting at a point `vecr=2hati-6hatj-12hatk`. The value of `alpha` for which angular momentum about origin is conserved is:

A

2

B

Zero

C

1

D

`-1`

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The correct Answer is:

D

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