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[20 points] A single isolated point charge is carrying a charge q = 4 [nc]. As shown in the figure, two equipotential surfaces consist of two spheres centered on the point charge : o Sphere 1 of radius r₁ = 8 [m]. Sphere 2 of radius r2 r1 where r2 is unknown. o 1) [5 points] Find V₁, the electric potential on the surface of Sphere 1. V₁ = [V] q --Sphere2 Sphere1 W = 2 11 2) [10 points] If Sphere 2 is separated from Sphere 1 by a difference of potential AV =4.78 [V]. Find r2, the radius of Sphere 2 (Type the detailed solution to this question in the below box, Show all your calculation steps by typing in the box). 3) [5 points] Find the work required to bring an electron (qe = -1.6 x 10-¹⁹) [C] from Sphere 2 to Sphere 1 considering that AV = 4.78 [V]. [J]