1. The problem statement, all variables and given/known data What is a point charge? and what is the purpose of it when the definition of coulomb's law says,"force b/w TWO POINT CHARGES is directly proportional to their magnitude,and inverse to the square of their distance....."...I mean what is the use of it,why only point charges?? 2. Relevant equations F=kq1q1/r(sq.) 3. The attempt at a solution Ok as far as I can get it,point charge is a charge which is very very small,but I still couldn't get the idea of "Point" charge please explain and also why we use them?