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qlzlahs
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Homework Statement
A +4.0 μC-point charge and a -4.0 μC point charge are placed as shown in the figure. What is the potential difference, V_A - V_B, between points A and B? (k = 1/4πε_0 = 8.99 × 10^9 N · m^2/C^2)
https://www.physicsforums.com/attac...2/?temp_hash=fc256c7e6e7317423fc360366b1c7272
Homework Equations
V = (k*q)/r
The Attempt at a Solution
Point B is 0.30 m away from the -4.0 μC point charge. The potential there is (9*10^9*-4*10^(-6))/(.3) = -120,000 V.
Point A is 0.30 m away from the 4.0 μC point charge. The potential there is (9*10^9*4*10^(-6))/(.3) = 120,000 V.
So I thought I could do V_A - V_B = 120,000V - (-120,000V) = 240,000V but that doesn't work.
Help please? Thanks.