A charge is moved in an electric field of a fixed charge distribution from point A to another point B slowly. The work done by external agent in doing so is 100J . What is the change in potential energy of the charge as it moves from A to B ? What is the work done by the electric field of the charge distribution as the charge moves from A to B ?

Explanation

`W_(ext)= DeltaU = U_(B)-U_(A) = 100J`
As, `bar(F_(ext))= - vec(F_(E))` for the charge to move slowly , so
`E_(E ) = - W_(ext)= - 100 J`