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12th Class Physics Electric Charges and Fields Question Bank MCQ - Electric Charges and Fields

  • question_answer
    Two points charges of \[1\mu C\] and \[-1\mu \,C\]are separated by a distance of 100  A point P is at a distance of 10 cm from the midpoint and on the perpendicular bisector of the line joining the two charges. The electric field at P will be

    A) \[9\,N{{C}^{-1}}\]                        

    B) \[0.9\,N{{C}^{-1}}\]

    C) \[90\,N{{C}^{-1}}\]                        

    D) \[0.09\,N{{C}^{-1}}\]

    Correct Answer: D

    Solution :

    (d) \[0.09\,N{{C}^{-1}}\] The point lies on equatorial line of a short dipole. \[\therefore \,\,E=\frac{2ql}{4\pi {{\varepsilon }_{0}}{{r}^{3}}}=\frac{9\times {{10}^{9}}\times {{10}^{-6}}\times {{10}^{-8}}}{{{\left( {{10}^{-1}} \right)}^{3}}}\]                                                                                       


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