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fallenshadow95
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Homework Statement
A -10.0 nC point charge and a +20.0 nC point charge are 15.0 cm apart on the x-axis.
a. What is the electric potential at the point on the x-axis where the electric field is zero?
b. What is the magnitude of the electric field at the point on the x-axis, between the charges, where the electric potential is zero?
Homework Equations
E = kQ/r^2
V = Ed
U = kQq/r
The Attempt at a Solution
Let x be the distance from the -10nC point where the field is zero in cm
r = .15m
k = Coulomb's constant (8.99*10^9)
q1 = -10nC
q2 = 20nC
I tried solving for where the electric field would be zero by first doing:
[tex]0 = \frac{k*q_1}{(x)^2} + \frac{k*q_2}{(r-x)^2}[/tex]
Solving for x, I got x = -0.36m and 0.062m
I'm not really sure how to proceed from here since I have two points where it seems that the field is zero.