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

  • question_answer
    Among two discs A and B, first have radius 10 cn and charge \[{{10}^{-6}}\mu C\]and second have radius 30 cm and charge \[{{10}^{-5}}C.\] When they are touched, charge on both \[{{q}_{A}}\]and \[{{q}_{B}}\]respectively will, be

    A) \[{{q}_{A}}=2.75\mu C,{{q}_{B}}=3.15\mu C\]

    B) \[{{q}_{A}}=1.09\mu C,{{q}_{B}}=5.5\mu C\]

    C) \[{{q}_{A}}={{q}_{B}}=5.5\mu C\]

    D) None of these

    Correct Answer: C

    Solution :

    [c] The charge on disc A is \[{{10}^{-6}}\mu C.\] The charge on disc B is \[10\times {{10}^{-6}}\mu C.\] The total this charge on both \[=\,11\,\mu \,C.\]When touched, this charge will be distributed equally i.e. \[5.5\mu C\] on each disc.


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