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12th Class Physics Electrostatics & Capacitance Question Bank MCQ - Electrostatic Potential and Capacitance

  • question_answer
    An electric dipole consisting of charges +q and    -q separated by a distance L is in stable equilibrium in a uniform electric field\[\overrightarrow{E}\]. The electrostatic potential energy of the dipole is:                                                              (CBSE 2020)

    A) qLE                             

    B) zero      

    C) -qLE                            

    D) -2qEL

    Correct Answer: C

    Solution :

    (c) -qLE At stable equilibrium, Potential energy is maximum i.e., Potential energy = - pE(+1) \[\left[ \because \,\,\cos \theta =+1 \right]\] \[=-pE\] \[=-qLE\]                                     \[\left[ \because \,\,p=qL \right]\]


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