A force F→=αi^+3j^+6k^ is acting at a point r→=2i^-6j^-12k^ . The value of α for which angular momentum about origin is conserved is:

Question

A force

\vec{F} = α \hat{i} + 3 \hat{j} + 6 \hat{k}

is acting at a point

\vec{r} = 2 \hat{i} - 6 \hat{j} - 12 \hat{k}

. The value of

α

for which angular momentum about origin is conserved is:

2

Zero

1

- 1

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