If the dipole is rotated from an initial position perpendicular to the field to any angle $ heta$ w

Question

If the dipole is rotated from an initial position perpendicular to the field to any angle $	heta$ with the direction of field the work done is\

Professor PC Thomas Classes · Answer

Here $	heta_{1}=90, 	heta_{2}=	heta$ $$ \begin{aligned} 	herefore & \mathrm{U}=\mathrm{PE}\left(\cos 	heta_{1}-\cos 	heta_{2}ight) \ & =\mathrm{PE}(\operatorname{Cos} 90-\cos 	heta)=\mathrm{PE}(0-\cos 	heta) \ & =-\mathrm{PE} \cos 	heta \end{aligned} $$