A uniform charge density of 460 ncm3 is distributed

Question

Compute all parts of given question:

Problem: A uniform charge density of 460 nC/m^3 is distributed throughout a spherical volume of radius 6.00 cm. Consider a cubical Gaussian surface with its center at the center of the sphere.

Part A: What is the electric flux through this cubical surface if its edge length is 2.85 cm?

N•m²/C

Part B: What is the electric flux through this cubical surface if its edge length is 18.5 cm?

N•m²/C

Please help for the above problem, completely confused!! Show each steps if possible, Thanks.