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Q. The plates of a parallel-plate capacitor are 2.50 {rm mm} apart, and each carries a charge of magnitude 85.0 {rm nC}. The plates are in vacuum. The electric field between the plates has a magnitude of 5.00×106 V/m. What is the potential difference between the plates?

Q. Two particles are fixed to an x axis: particle 1 of charge q1 = +2.1 10-8 C at x = 20 cm and particle 2 of charge q2 = -4.00q1 at x = 70 cm. At what coordinate on the axis is the net electric field produced by the particles equal to zero?

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