A) 1
B) -1
C) 2
D) zero
Correct Answer: B
Solution :
Angular momentum will be conserved if net torque acting on the system becomes zero. Given force acting \[\vec{F}=\alpha \hat{i}+3\hat{j}+6\hat{k}\] (i) and \[\vec{r}=2\hat{i}-6\hat{j}-12\hat{k}=-2(-\hat{i}+3\hat{j}+6\hat{k})\] (ii) If torque becomes zero then \[\vec{r}\times \vec{F}=0\] If \[\alpha =-1\]then, \[\vec{r}\times \vec{F}=0\]You need to login to perform this action.
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