Question

An Electric Dipole Of Dipole Moment Is Kept In An Electric Field Of Strength 1000With It’S Dipole Moment In The Direction Of The Field. What Is The Work Done By The Electric Field If The Dipole Is Rotated In The Field So That It’S Dipole Moment Makes An Angle With The Field From It’S Initial Position?

Answer 1

Explanation:

Electric field will produce a torque on the dipole.

Torque , τ=pEsinθ

The work done in rotating it from an equilibrium position by an angle θ is W=∫

0

θ

τdθ=pE∫

0

θ

sinθdθ=−pE(cosθ−cos0)=pE(1−cosθ)