An electric dipole of moment ‘p’ is placed normal to the lines of force of a uniform electric intensity E, then the work done in deflecting it through an angle of 180° is

An electric dipole of moment ‘p’ is placed normal to the lines of force of a uniform electric intensity E, then the work done in deflecting it through an angle of 180° is

  1. A

    pE

  2. B

    +2pE

  3. C

    -2pE

  4. D

    zero

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    Solution:

    Here,

    θ1=90o θ2=90o+180o =270o

    Work done is change in potential energy of the dipole

    =θ1=90θ2=270pE sinθ dθ =[-pE cosθ]90270 =0

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