An electric dipole of moment ' P ' is placed in the position of stable equilibrium in a uniform elec

Question

An electric dipole of moment ' P ' is placed in the position of stable equilibrium in a uniform electric field of intensity ' $E$ '. The work done in reversing the dipole in the field is\

Professor PC Thomas Classes · Answer

$\mathrm{W}=\mathrm{PE}\left(\cos 	heta_{1}-\cos 	heta_{2}ight)$\ $	heta_{1}=0, 	heta_{2}=180$\ $\mathrm{W}=\mathrm{PE}(\cos 0-\cos 180)$ $$ =\mathrm{PE}[1-(-1)]=2 \mathrm{PE} $$