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BCECE Medical BCECE Medical Solved Papers-2010

  • question_answer
    A force \[\vec{F}=a\hat{i}+3\hat{j}+6\hat{k}\] is acting at a point\[\vec{r}=2\hat{i}-6\hat{j}-12\hat{k}\]. The value of a for which angular momentum is conserved is

    A)  zero           

    B)  1

    C)  -1             

    D)  2

    Correct Answer: C

    Solution :

    For angular momentum to be conserved \[{{\vec{T}}_{ext}}=0\] \[\Rightarrow \] \[\frac{a}{2}=\frac{3}{-6}=\frac{6}{-12}\] \[\Rightarrow \] \[a=\frac{2\times 3}{-6}=-1\]


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