## anonymous 5 years ago workdone by electric field or external agent

2. anonymous

explain

3. anonymous

what is it please explain it

4. anonymous

The work done by any force to move a point +ve charge from a to b is given by $W = \int\limits_{a}^{b}F.dr$ F.dr = |F||dr|cos(a) where a is the angle between applied force and displacement produced. Since the work done by an external agent will obviously be due to a force in the direction of the displacement cos(a) =1. Similarly it will be -1 for electric field as it will act against the produced displacement. since work done is a vector this shown by W(E) = - W(Agent).