Solve the all parts of following question given below:
Question: Positive charge is spread uniformly over the surface of a spherical balloon 70cm in radius, resulting in an electric field of 36kN/C at the balloon's surface.
Part A. Find the field strength 50cm from the balloon's center.
Part B. Find the field strength 200cm from the center.
Part C. What is the net charge on the balloon?
I would really appreciate some help.