Solve the all parts of given question:
Question: A solid metal sphere with radius 0.420m carries a net charge of 0.280nC.
Part A: Find the magnitude of the electric field at a point 0.100m outside the surface of the sphere.
Part B: Find the magnitude of the electric field at a point inside the sphere, 0.100m below the surface.
I need help to solve the above problem and express your answer using three significant figures.