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(1)Find the magnitude of the electric field at a point (5.7E-2) m from the center of the sphere.

(2) Find the magnitude of the electric feild at the surface of the sphere

(3) find the magnitude of the electric field at a point (2E-2) m from the center of the sphere.

Thanks!

Relevant Equations:

Volume of sphere:4/3(pi)r^3

(D) Charge Density=Charge/volume

[Attempt]

I tried to find Q (charge) using D=Q/(4/3(pi)r^3)

Now I am Lost. There are many Electrical Field Equations. I tried plugging into EA=Q/ε but it did not work. I also tried E=q/((4/3(pi)r^2)r^3)

Please help me solve this. Can I see a step by step guide?

Thank you