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Two charged particles are fixed to an x axis : Particle 1 of charge `q_(1) = 2.1 xx 10^(-8) C` is at position x = 20 cm and particle 2 of charge `q_(2) = -4.00 q_(1)` is at position x = 70 cm. (a) At what coordinate on the axis (other than at infinity) is the net electric field produced by the two particles equal to zero ? (b) What is the zero-field coordinate if the particles are interchanged ?

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(a) -30 cm, (b) 120 m
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