Question: Two 2.0-cm-diameter insulating spheres have a 6.0 cm space between them. One sphere is charged to +10 nC, the other to -15 nC. What is

Two 2.0-cm-diameter insulating spheres have a 6.0 cm space between them. One sphere is charged to +10 nC, the other to -15 nC. What is the electric field strength at the midpoint between the two spheres?

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