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

  • question_answer
    The electric field that can balance a charged particle of mass \[3.2\times {{10}^{-27}}\,kg\] is (Given that the charge on the particle is \[1.6\times {{10}^{-19}}C\])

    A) \[19.6\times {{10}^{-8}}N{{C}^{-1}}\]

    B) \[20\times {{10}^{-6}}N{{C}^{-1}}\]

    C) \[19.6\times {{10}^{8}}N{{C}^{-1}}\]

    D) \[20\times {{10}^{6}}N{{C}^{-1}}\]

    Correct Answer: C

    Solution :

    (c) \[19.6\times {{10}^{-8}}N{{C}^{-1}}\] Here, \[m=3.2\times {{10}^{-27}}kg,\]\[e=1.6\times {{10}^{-19}}C\], \[g=9.8\,m{{s}^{-2}}\] As \[E=\frac{F}{q}=\frac{mg}{e}=\frac{3.2\times {{10}^{-27}}}{1.6\times {{10}^{-19}}}=19.6\times {{10}^{-8}}N{{C}^{-1}}\]


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