Two small insulating spheres with radius 3.00×10−2 m are separated by a large center-to-center distance of 0.545 m . One sphere is negatively charged, with net charge -1.40 μC , and the other sphere is positively charged, with net charge 4.20 μC . The charge is uniformly distributed within the volume of each sphere. What is the magnitude E of the electric field midway between the spheres? Take the permittivity of free space to be ϵ0 = 8.85×10−12 C^2/(N⋅m^2)

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