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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Electric Dipole

  • question_answer
    A molecule with a dipole moment p is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field. If the dipole is to be rotated to be anti-parallel to the field, the work required to be done by an external agency is                                                    [UPSEAT 2004]

    A)                    ? 2pE

    B)                                      ? pE

    C)                    pE

    D)                                      2pE

    Correct Answer: D

    Solution :

                       \[W=PE(1-\cos \theta )\]  here \[\theta =\text{18}{{0}^{\text{o}}}\] \[\therefore \] W = \[PE\,(1-\cos {{180}^{o}})\] = \[PE\,[1-(-1)]=2PE\]


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