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physics10189
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Homework Statement
a point charge of +5c is located at x=-2cm, and a second point charge of -6c is located at x=1cm
where should a thid charge of +4c be placed so that electric field at x=0cm is zero?
Homework Equations
E(total)=E1+E2+E3
E=k*q/(r^2)
The Attempt at a Solution
E(total)=0
E3=-E1-E2
what I did first is divide the k out so now the equation will look like this
q3/(r3^2)=-(q1/(r1^2))-(q2/r2^2))
and then solve for r3 and put a negative sign because the force is going to the right to the electric field at x=0
i got r3=-.917cm
It is saying I am getting this wrong can anyone tell me what i am doing rong