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

  • question_answer
    Two large thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities   of   opposite   signs   and   magnitude\[27\times {{10}^{-22}}C{{m}^{-2}}\]. The electric field \[\overrightarrow{E}\] in region II in between the plate is:

    A) \[4.25\times {{10}^{-8}}N{{C}^{-1}}\]

    B) \[6.28\times {{10}^{-10}}N{{C}^{-1}}\]

    C) \[3.05\times {{10}^{-10}}N{{C}^{-1}}\]

    D) \[5.03\times {{10}^{-10}}N{{C}^{-1}}\]

    Correct Answer: C

    Solution :

    (c) \[3.05\times {{10}^{-10}}N{{C}^{-1}}\] The value of \[\overrightarrow{E}\]in the region II, in between the plates \[=\frac{\sigma }{{{\varepsilon }_{0}}}\] \[=\frac{27\times {{10}^{-22}}}{8.85\times {{10}^{-12}}}=3.05\times {{10}^{-10}}N{{C}^{-1}}\]


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