Two charges q = 4.0? C are fixed in space a distance d = 2.5 cm apart, as shown

Question

Two charges q = 4.0? C are fixed in space a distance d = 2.5 cm apart, as shown in the figure. With V = 0 at infinity, what is the electric potential at point C?

B)You bring a third charge q = 4.0?C from infinity to C. How much work must you do?

C)What is the potential energy U of the three-charge configuration when the third charge is in place?

Two charges q = 4.0? C are fixed in space a distance d = 2.5 cm apart, as shown in the figure. With V = 0 at infinity, what is the electric potential at point C? You bring a third charge q = 4.0?C from infinity to C. How much work must you do? What is the potential energy U of the three-charge configuration when the third charge is in place?

Explanation / Answer

let q1 = q2 = q3 = 4*10^-6 C

let r12 is the distance between q1 and q2

r23 is the distance between q2 and q3

r13 is the distance between q1 and q3.

A) potential at point C, Vc = k*q1/r13 + k*q2/r23


B) workdone W = q3*Vc


C) U = k*q1*q2/r12 + k*q2*q3/r23 + k*q3*q1/r13

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