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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2005

  • question_answer
    Force acting between two point charges (+q and + q) distance r apart in the air is F. One charge is rotated about the other charge on a circle of radius r. The work done will be

    A)  \[F\times r\]                                    

    B)  \[F\times 2\pi r\]

    C)  \[F\times 2r\]       

    D)  zero              

    Correct Answer: D

    Solution :

    Work done \[\vec{W}=\vec{F}.\vec{s}=F\,\,s\,\cos \,\theta \] here       \[F\bot s,\] \[\therefore \]  \[\theta ={{90}^{o}}\]                 \[\vec{W}=0\]


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