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Write an expression for the work done on...

Write an expression for the work done on an electric dipole of dipole moment p in turning it from it’s position of stable equilibrium to a position of unstable equilibrium in an uniform electric field E ?

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The correct Answer is:
`W=PE(costheta_1-costheta_2)=PE(cos0^@-180^@0=PE(1+1)=2PE`
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