I need help about Potential energy. Here is the link that define about Potential energy: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elepe.html
\(U=k\dfrac {Qq} {r}\) is the potential energy of a test charge q in the vicinity of Q. Could you clarify how the formula is derived?
\(U=k\dfrac {Qq} {r}\) is the potential energy of a test charge q in the vicinity of Q. Could you clarify how the formula is derived?