Lecture 9 : Potential Energy of a System of Charges
Potential Energy of a System of Charges
Assume all charges to be initially at infinity. We assemble the charges by bringing the charges one by one and fix them in their positions. There is no energy cost in bringing the first charge and putting it at P, as there is no force field. Thus .
and putting it at P
, as there is no force field. Thus 
.
