A Force F=alphahat(i)+3hat(j)+6hat(k) is...

A Force `F=alphahat(i)+3hat(j)+6hat(k)` is acting at a point `r=2hat(i)-6hat(j)-12hat(k)`. 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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2

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