Electric Potential Energy Of A System Of Point Charges

Electric Potential Energy Of A System Of Point Charges — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.

Electric Potential Energy of a System of Point Charges Valid for point charges or spherically symmetric charge distributions (acting as point charges at center). Assumes potential is zero at infinity. Define Work done by external agent to bring charge q2 from infinity to r in field of q1 W = Integral of (-Force electric) dot dr from infinity to r Force electric = k q1 q2/r 2 Integrate k q1 q2/r 2 dr to get -k q1 q2/r Apply limits: Upper (r) minus Lower (infinity) results in U = k q1 q2/r r > 0 Charges must be static relative to each other for the electrostatic definition Confusing the denominator r with r 2 (Force vs Energy) Neglecting the signs of charges (Energy is a scalar but can be negative, indicating a bound state) Confusing Electric Potential (V, unit Volts) with Electric Potential Energy (U, unit Joules)