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## Homework Statement

at a point midway between two point charges separated by 0.10 meters, the magnitude of the electric field is 10V/m and the electric potential is zero. what are the two charges

## Homework Equations

electric potential - > point charge V = kq/r

electric potential difference = electric potential V = kq [(1/r_B) - (1/r_A)] where r is the distance, k is constant = 9*10^9, q is charge in coulombs

electric field E = qF where q is charge, F is force in newtons

force F = kq_1q_2/r^2

## The Attempt at a Solution

r = 0.05m

I need to be able to isolate the two charges so that i can solve for one and then subsitute the value in to solve for the other.

if i use electric potential difference eq, how do i involve two charges? the radii should be the same, correct? but if radii are the same won't i get zero in the [] and then q = 0. also if i use that equation i will not be able to factor in electric field.

i am supposed to get q_A = -q_B = 1.39*10^-12 coulombs

help appreciated

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