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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 of magnitude \[16\times {{10}^{-22}}\,C{{m}^{-2}}\]. The electric field between the plate is:

    A) \[1.8\times {{10}^{-10}}N{{C}^{-1}}\]

    B) \[1.9\times {{10}^{-10}}N{{C}^{-1}}\]

    C) \[1.6\times {{10}^{-10}}N{{C}^{-1}}\]

    D) \[1.5\times {{10}^{-10}}N{{C}^{-1}}\]

    Correct Answer: A

    Solution :

     \[1.8\times {{10}^{-10}}N{{C}^{-1}}\] Here,    \[E=\frac{\sigma }{{{\varepsilon }_{0}}}=\frac{16\times {{10}^{-22}}}{8.854\times {{10}^{-12}}}\] \[=1.8\times {{10}^{-10}}N{{C}^{-1}}\]


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