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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Self Evaluation Test - Electric Chages and Fields

  • question_answer
    The electric field intensity just sufficient to balance the earth?s gravitational attraction on an electron will be: (given mass and charge of an electron respectively are \[9.1\times {{10}^{-31}}kg\]and \[1.6\times {{10}^{-19}}C.\])

    A) \[-\,5.6\times {{10}^{-11}}N/C\]

    B) \[-\,4.8\times {{10}^{-15}}N/C\]

    C) \[-\,1.6\times {{10}^{-19}}N/C\]

    D) \[-\,3.2\times {{10}^{-19}}N/C\]

    Correct Answer: A

    Solution :

    [a] \[-eE=mg\] \[\vec{E}=-\frac{9.1\times {{10}^{-31}}\times 10}{1.6\times {{10}^{-19}}}=-5.6\times {{10}^{-11}}N/C\]


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