(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

One charge of (+5µC) is placed in the air at exactly x = 0, and a second charge (+7µC) at x = 100cm. where can the third charge be placed so as to experience zero net force due to the other charges?

2. Relevant equations

F=KQ1Q2 / D^2

3. The attempt at a solution

Q1 = +5µC,

Q2 = +7µC,

Q3d from q1 = D1,

K = 9*10^9,

100 cm = 1 m

D1+D2=1m,

1m - D1 = D2.

K(q1*q3)/d1^2)=K(q2*q3)/(1-D1)^2

Then the k's cancel each other out and the Q3's cancel each other out.

(q1)/(d1^2)=(q2)/(1-D1)^2

Is this correct? also can you give me an example on solving this equation if it is correct?

Another thing

if Q1 had a smaller and opposite charge compared to Q2, the equation would be?

(q1)/(d1^2)=(q2)/(1+D1)^2

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# Coulomb's law point charges distance for 0 net force

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