Calculate the amount of work done in turing an electric dipole of dipole moment `2 xx 10^(-8) C -m` from its position of unstable eqquilibrium to its position of stable equilibrium, in a uniform electric field of `10^3` N `C^(1)`.

Explanation

Here `p = 2 xx 10^(-8) C-m, E = 10^(3) N C^(-1)`. In unsatable equilibrium state `theta_1 = 180^@` and for stable equilibrium state `theta_2 = 0^@`. Therefore,
Work done `W = pE[cos theta_1 - cos theta_2] = 2 xx 10^(-8) xx 10^3 xx [ cos 180^@ - cos 0^@] = - 4 xx 10^(-5)J`