# Homework Help: Gauss's Law, electric field of sphere

1. Feb 3, 2010

### krtica

Q:
A nonconducting sphere of radius 10.00 cm carries a uniform volume charge density ρ = 410 nC/m3.

(a) What is the total charge of the sphere?
1.717 nC

Find the electric field at the following radii.

(b) r = 2.10 cm
_____N/C

(c) r = 9.90 cm
_____kN/C

(d) r = 10.10 cm
_____N/C

(e) r = 13.6 cm
_____N/C

My attempt at the problem, after manipulating the equation EV=charge inside/[8.85x10^(-12)], was just to insert values into E=Qr/[(4*pi*R^3)*8.85x10^(-12)]; where Q is defined as the total charge, r the radius asked to calculate and R the initial radius.

2. Feb 3, 2010