- #1
jmr423
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Homework Statement
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?
Homework Equations
F=KQ1Q2 / D^2
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