Electric Potential: finding charges (physics)?
The graph in the figure shows the electric potential energy as a function of separation for two point charges. If one charge is +0.44 nC, what is the other charge?
answer in nC
The PE formula is;
U = kqQ/r
From graph U = -4x10^-6 J when r=.01 m
-4x10^-6 = (9x10^9)(.44x10^-9)Q/.01
Q = - 10 nC