- #1
Bradman
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Homework Statement
Two point charges are fixed on the y axis: a negative point charge q1 = -24 µC at y1 = +0.20 m and a positive point charge q2 at y2 = +0.37 m. A third point charge q = +9.0 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other two charges has a magnitude of 26 N and points in the +y direction. Determine the magnitude of q2.
Homework Equations
F = K(q1q2)/r^2
The Attempt at a Solution
First I found the magnitude of force between q and q1 and set up the equation for q1 and q2:
[(8.99*10^9)(9.0*10^-6)(2.4*10-5)]/(0.20^2) = 48.546N
[(8.99*10^9)(2.4*10^-5)(q2)]/(0.17^2) = F
Then I did my equation to find the force for the 2nd equation (-48.546 since it's an attractive force):
F - 48.546N = 26N
F = 74.546
Then solved for q2:
q2 = [(74.546)(0.17^2)]/[(8.99*10^9)(2.4*10^-5)] = 9.985*10^-6
WebAssign tells me I'm incorrect, and I can't tell where I've gone wrong...