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

li have three charges, 2 with same charge (magnitude and sign) and 1 with a smaller charge(smaller magnitude and opposite sign to the other two). how would i position them on a line so that the net force on any of them is zero

2. Relevant equations

electric force, F = k(q1)(q2)/r^2 where q1 and q2 are point charges, k = 9*10^9, r is distance between charges

electric force, point charge Fp = kq/r^2

3. The attempt at a solution

where magnitude q_a > magnitude q_b

fnet = k(+q_a)/a^2 + k(+q_a)/b + k(-q_b)/c^2

0 = k(+q_a)/a^2 + k(+q_a)/b + k(-q_b)/c^2

k(q_b)/c^2 = k(+q_a)/a^2 + k(+q_a)/b

now what do i do? is my relationship correct?

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# Homework Help: Position three point charges so net force is zero

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