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**1. Homework Statement**

The electric field at a distance of 0.143m from the surface of a solid insulating sphere with radius 0.381m is 1630N/C .

a) Assuming the sphere's charge is uniformly distributed, what is the charge density inside it?

b) Calculate the electric field inside the sphere at a distance of 0.237m from the center.

**2. Homework Equations**

E1/E2 = r1/r2

E = Cr

**3. The Attempt at a Solution**

a) I know that the electric field for part a can be found by using the formula E=Cr, so I can get C = 4278.22 N/(C*m). I know that the charge density is a factor of C, but I do not know the actual formula for it.

b) This should be able to be solved with the ratio E1/E2 = r1/r2, and when I solve for E2 I get a result of 737.2 N/C. This result is not correct, but I am not sure if the problem is in my ratio.