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NEET NEET SOLVED PAPER 2016 Phase-II

  • question_answer
    An electric dipole is placed at an angle of \[{{30}^{o}}\] with an electric field intensity\[2\times {{10}^{5}}N/C\].It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is

    A)  8 mC              

    B)  2 mC

    C)  5 mC              

    D)  \[2\mu C\]

    Correct Answer: B

    Solution :

    \[\tau =PE\,\sin \,\theta \] \[\Rightarrow \tau =qIE\,\sin \theta \] \[\Rightarrow q=\frac{\tau }{IE\,\sin \theta }\] \[=\frac{4}{2\times {{10}^{-2}}\times 0.5\times 2\times {{10}^{5}}}=2mc\]


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