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A dipole of electric moment p is located...

A dipole of electric moment p is located at a distance r from a long thread charged with a linear density `lambda` . Find the force on the dipole if (a) if is placed parallel to the thread , (b) perpendicular to the thread .
[Hint : Field due to long thread = `(1)/(2 pi epsi_(0)) (lambda)/(r)`]

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