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Homework Statement
A charge 2Q is placed a distance 'd' from charge 4Q. A third charge 'q' is placed 3m from charge 2Q directly on the line between charges 2Q and 4Q. Find d and q such that the force between charges 2Q and 4Q is equal to 0.
Homework Equations
Coulomb's law: f = k(|q1q2|)/r2
k = 8.99 x 10^9 (Nm^2/c^2)
The Attempt at a Solution
(k)(2Q)(q)/3 = [k(4Q)(q)]/(d - 3)
(d - 3)/3 = 2
d - 3 = 6;
d = 9m?k(2Q)(q)/3 + [k(4Q)(q)]/6 = k(2Q)(4Q)/9;
q[(k4Q)/6 + (k4Q)/6] = k8Q2/9;
q[k4Q/3] = k8Q2/9;
q = (3)(2Q)/9 ?
q = 2Q/3 ?