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EAMCET Medical EAMCET Medical Solved Paper-1997

  • question_answer
    A charge q is placed at the centre of the line joining two equal charges Q to establish equilibrium. The system of three charges will be in equilibrium if q is equal to:

    A)  +Q/4                                    

    B)  +Q/2

    C)  -Q/2                                     

    D)  -Q/4

    Correct Answer: D

    Solution :

                     If the system containing three charges in equilibrium then, \[\frac{Qq}{{{r}^{2}}}=\frac{QQ}{{{(2r)}^{2}}}=0\]                             \[\frac{Qq}{{{r}^{2}}}=-\frac{{{Q}^{2}}}{4{{r}^{2}}}\] \[q=-\frac{Q}{4}\]


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