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1. An electron and a proton are a distance r = 3 10 -9 m apart. How much energy is required to increase their separation

1. An electron and a proton are a distance r = 3 10^-9 m apart. How much energy is required to increase their separation by a factor of 3?

2. Consider a solid sphere of radius R = 0.3 m that is uniformly charged with = -17 C/m³. What is the electric potential a distance 4.5 m from the center of the sphere?

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