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1-the electrical potential at certain distance of a charge of 600 V. and the electrical field is 200 N/C. At what distance of this charge is it necessary to place a charge of 0.1x10 ^-6 C and the opposite sign for that the potential in the same point is null?

My Answer: 1.5m

2-three charge q1 = 1.5x10 ^-3 C, q2 = 0.5x10 ^-3 C and q2 = 0.2x10 ^-3 C are distributed in a plane, forming a triangle. The straight line that it joins q1 with q3 measures 1 m, the straight line that it joins q2 with q3 measures 0.5 m and the angle that both straight lines form is 30 °. Which is the potential entire energy of the system?

My answer: -24.6x10^3 J

3-Two metallic big and parallel badges are placed at a distance of 0.5 cm between both. if between them there gets connected a source of electrical energy which difference of electrical potential is 90 V.: Which will be the charge for unit of area in the surface of the badges?

my answer: -3.2x10^-7 C/m^2

thnks for att.