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Goldenwind
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[SOLVED] Electric Charge
Two point charges q and 4 q are distance L apart and free to move. A third charge is placed so that the entire three-charge system is in static equilibrium. What is the magnitude of the third charge?
F = kq1q2 / r^2
k ~= 8.988x10^9
Not a clue. All I've figured out is that for this to work in perfect equilibrium, the third charge must be directly in between the first two.
Not looking for an all-out solution from anyone (Although that'd be cool too), but more looking for just a push in the right direction.
In theory, it'd involve drawing free body diagrams for the three charges, and then working with the charge q3 to balance the equilibrium... but I can't grasp my head around that.
Homework Statement
Two point charges q and 4 q are distance L apart and free to move. A third charge is placed so that the entire three-charge system is in static equilibrium. What is the magnitude of the third charge?
Homework Equations
F = kq1q2 / r^2
k ~= 8.988x10^9
The Attempt at a Solution
Not a clue. All I've figured out is that for this to work in perfect equilibrium, the third charge must be directly in between the first two.
Not looking for an all-out solution from anyone (Although that'd be cool too), but more looking for just a push in the right direction.
In theory, it'd involve drawing free body diagrams for the three charges, and then working with the charge q3 to balance the equilibrium... but I can't grasp my head around that.