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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Electric Field and Potential

  • question_answer
    The intensity of electric field required to balance a proton of mass \[1.7\times {{10}^{-27}}kg\] and charge\[1.6\times {{10}^{-19}}C\] is nearly

    A)            \[1\times {{10}^{-7}}\ V/m\]

    B)                                      \[1\times {{10}^{-5}}\ V/m\]

    C)                    \[1\times {{10}^{7}}\ V/m\]

    D)                                      \[1\times {{10}^{5}}\ V/m\]

    Correct Answer: A

    Solution :

                 Since qE = mg or \[E=\frac{mg}{q}=\frac{1.7\times {{10}^{-27}}\times 9.8}{1.6\times {{10}^{-19}}}\] \[=10.0\times {{10}^{8}}=\text{ }1\times {{10}^{7}}V/m\]


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