Solve the all parts of given problem:
Problem: The electric field at a distance of 0.154m from the surface of a solid insulating sphere with radius 0.372m is 1790N/C.
Part A: Assuming the sphere's charge is uniformly distributed, what is the charge density inside it?
Part B: Calculate the electric field inside the sphere at a distance of 0.195m from the center.
Please show all work so I can fully understand all concepts!