A +30 mC point charge sits at the center of a spherical thick metallic shell, of 4.0 cm inner radius and 2.0 cm thickness. The net charge of the shell is -50mC. a.) Determine the location of the 0 volt equipotential surface. b.) calculate the electric potential of the metallic shell. c.) Give the expression for the electric potential in the entire space, V(r) as a function of the distance from the center. Sketch the graph of V(r)
V = kQ/r
E = kQ/r2
The Attempt at a Solution
a.) I believe the location will be anywhere inside the metallic shell, because it is a conductor.
b.) V = kQ/r = ((8.99 x 109 N(m/C2)(-50mC))/(2.0cm)
i dont think this is right. i think my biggest issue is converting units.
c.) For this i think it is the sum of the electric potential of the inside and the electric potential of the outside.
V = ((8.99 x 109 N(m/C2)(+30mC))/(2.0cm) + ((8.99 x 109 N(m/C2)(-50mC))/(2.0cm)