- #1
Hawkingo
- 56
- 2
we know that if the applied force is in the direction of the displacement then work done is positive.But in case of bringing 2 opposite charges from infinite to a certain distance,the work done is negative even the force and the displacement of the charge is in the same direction.
From mathematical point of view it says the applied force is positive here and the (dr) is negative here.but what's the physical significance of the sign is here?and if so when can we say the applied force is positive or negative(in case of bringing two same charges together)?
From mathematical point of view it says the applied force is positive here and the (dr) is negative here.but what's the physical significance of the sign is here?and if so when can we say the applied force is positive or negative(in case of bringing two same charges together)?