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NEET Sample Paper NEET Sample Test Paper-44

  • question_answer
    A force of \[\left( -F \right)\hat{k}\]acts on 0, the origin of the coordinate system. The torque about the point (1, -1) is:

    A) \[\operatorname{F}\left( \hat{i}+\hat{J} \right)\]              

    B) \[-\operatorname{F}\left( \hat{i}-\hat{j} \right)\]

    C) \[\operatorname{F}\left( \hat{i}-\hat{j} \right)\]                 

    D) \[-\operatorname{F}\left( \hat{i}+\hat{j} \right)\]

    Correct Answer: A

    Solution :

    Position vector \[\left( {\vec{r}} \right)=\hat{i}-\hat{j}\] \[\operatorname{Force} =-F\hat{k}\] \[\tau =\vec{r}\times \vec{F}\] \[\tau =F\left( \hat{i}-\hat{j} \right)\]


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