1. The problem statement, all variables and given/known data A thin spherical shell made of plastic carries a uniformly distributed negative charge -6e-10 coulombs (indicated as -Q1 in the diagram). Two large thin disks made of glass carry uniformly distributed positive and negative charges 1.5e-05 coulombs and -1.5e-05 coulombs (indicated as +Q2 and -Q2 in the figure). The radius R1 of the plastic spherical shell is 6 mm, and the radius R2 of the glass disks is 4 meters. The distance d from the center of the spherical shell to the positive disk is 18 mm. (a) Find the potential difference V1 - V2. Point 1 is at the center of the plastic sphere, and point 2 is just outside the sphere. (b) Find the potential difference V2 - V3. Point 2 is just below the sphere, and point 3 is right beside the positive glass disk. Remember that the sign of the potential difference is important. 2. Relevant equations Esphere = (1/4ε0)*(q/r2) Ecapacitor = Q/A/ε0 ΔV = - (E*ΔL) 3. The attempt at a solution a) Ecapacitor = Q/A/ε0 = (1.5e-5)/(4^2∏)/(8.85e-12) = 3.4e4 N/C ΔV = - (E*ΔL) = - (3.4e4 * .006) = -202.32 V/m b) I don't understand how to do part b. I really could use some help. Part A is correct.