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A force vecF= alpha hat i +3 hatj+6hatk ...

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

A

1

B

`-1`

C

2

D

zero

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