Chapter 24, Problem 83P

In Fig. 24-66, point P is at distance d₁ = 4.00 m from particle 1 (q₁ = −2e) and distance d₂ = 2.00 m from particle 2 (q₂ = +2e), with both particles fixed in place. (a) With V = 0 at infinity, what is V at P? If we bring a particle of charge q₃ = +2e from infinity to P, (b) how much work do we do and (c) what is the potential energy of the three-particle system?

Figure 24-66 Problem 83.