Question

Consider a thin, spherical shell of radius 14.5 cm with a total charge of 29.5 µC distributed uniformly on its surface. (a) Find the electric field 10.0 cm from the center of the charge distribution. (b) Find the electric field 21.5 cm from the center of the charge distribution.

Answer 1

10.0 zero, by Gauss' Law the symmetrical distribution will produce no internal electric fields

21.5 E = k Q / R^2 behaves as if all charge were at center

E = 9 E9 * 29.5 E-6 / .215^2 = 5.74E6 N/C