Solve the all parts of following problem:
Problem: A point charge of 7.80 microColoumbs is located at the origin and second charge of -4.90nanoColoumbs is located on the x axis an x=3.25cm.
Part A: Calculate the electric flux through a sphere centered at the origin with radius 1.30m.
Part B: Repeat the calculation for a sphere of radius 2.90m.
I need help to determine the electric flux through a sphere centered at the origin.