(Solved): For a single, isolated point charge carrying a charge of q=3.571011C, one equipotential surfac ...

For a single, isolated point charge carrying a charge of $$q=3.57\times 10^{?11}\mathrm{C}$$, one equipotential surface consists of a sphere of radius $$r_1=0.0259\mathrm{m}$$ centered on the point charge as shown in the figure. What is the potential on this surface? potential: Now consider an additional equipotential surface that is separated by $$7.57\mathrm{V}$$ from the previously mentioned surface. How far from the point charge should this surface be? This surface must also meet the condition of being farther from the point charge than the original equipotential surface.