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

  • question_answer
    If the dipole of moment \[2.57\times {{10}^{-17}}cm\] is placed into an electric field of magnitude \[3.0\times {{10}^{4}}N/C\]such that the fields lines are aligned at \[30{}^\circ \] with the line joining P to the dipole, what torque acts on the dipole?

    A) \[7.7\times {{10}^{-13}}Nm\]

    B) \[3.855\times {{10}^{-13}}Nm\]

    C) \[3.855\times {{10}^{-15}}Nm\]

    D) \[7.7\times {{10}^{-15}}Nm\]

    Correct Answer: B

    Solution :

    [b] \[\tau =\left( 2.57\times {{10}^{-17}}Cm \right)\left( 3.0\times {{10}^{4}}\frac{N}{C} \right)\left( \frac{1}{2} \right)\] \[=3.855\times {{10}^{-13}}Nm.\]


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