An electric dipole of moment p is lying along a uniform electric field E. The work

An Electric Dipole Of Moment P Is Lying Along A Physics QuestionAn Electric Dipole Of Moment P Is Lying Along A Physics Question

An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole by 90° is

Options

(a) pE
(b) √2 pE
(c) pE / 2
(d) 2pE

Correct Answer:

pE

Explanation:

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  • As Work done =∆U
    ∆pE=U(final) -U(intial)
    As U=-PECOSθ
    Ui=-PECOS0°=-PE
    Uf=-pECOS90°=0 As cos90=0
    So workdone =Uf -Ui
    Workdone=0-(-PE)
    Workdone=PE

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