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(i) Derive the expression for electric ...

(i) Derive the expression for electric field at a point on the equatorial line of an electric dipole.
(ii) Depiet the orientation of the dipole in (i) stable, (ii) unstable equilibrium in a uniform electric field.

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Add the horizontal component of electric field `E=E_(1)cos theta+E_(2)cos theta`, then put `E_(1)=E_(2)` and value of `cos theta`.
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