Electrostatic Potential Energy of a System of Three Point Charges

Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics:

Electrostatic Potential Energy of a System of Three Point Charges:

Let we consider a system of three point charges q₁, q₂ and q₃ having position vector r₁, r₂ and r₃ respectively.

If we bring charge q₁ from infinity to point A, no work is required because there is no any electric field there. So

 

 

Hence, the electrostatic potential energy of a system (q₁+q₂+q₃) is
 
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