An electric dipole consists of two opposite charges each $1 \mu \mathrm{C}$ separated by 2 cm . The

Question

An electric dipole consists of two opposite charges each $1 \mu \mathrm{C}$ separated by 2 cm . The dipole is placed in an external uniform field to $10^{5} \mathrm{~N} / \mathrm{C}$, the work done in rotating the dipole through $180^{\circ}$ starting from the position $	heta=0$ is\

Professor PC Thomas Classes · Answer

Work done in rotating from $	heta_{1}$ to $	heta_{2}$ is\ $\mathrm{w}=\mathrm{PE}\left(\cos 	heta_{1}-\cos 	heta_{2}ight)$\ Here $	heta_{1}=0, 	heta_{2}=180$\ $\cos 	heta_{1}=1 \quad \cos 	heta_{2}=-1$\ $\mathrm{w}=\mathrm{PE}[(1-(-1)]=2 \mathrm{PE}$