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Three particles are fixed on an x axis. Particle 1 of charge q1 is at x...

Three particles are fixed on an x axis. Particle 1 of charge q1 is at x = -a and particle 2 of charge q2 is at x = +a. If their net electrostatic force on particle 3 of charge Q is to be zero, what must be the ratio q1/q2 when particle 3 is at (a) x = +0.698a and (b) x = +1.53a?

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Answer #1

Concept: for the force on Q to be zero, field due to the charges q1 and q2 must cancel each other. We use this as shown below to find the ratio,

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