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In Fig., particles 1 and 2 are fixed in ...

In Fig., particles 1 and 2 are fixed in place on an axis, at a separation of L = 6.00 cm. Their charges are `q_(1) = +e` and `q_(2) = -27e`. Particle 3 with charge `q_(3) = +4e` is to be placed on the line between particles 1 and 2 , so that they produce a net electrostatic force `vec(F)_("3,net")` on it. (a) At what coordinate should particle 3 be placed to minimize the magnitude of that force ? (b) What is that minimum magnitude ?

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(a) 1.50 cm, (b) `1.64 xx 10^(-23)N`
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