In Figure a non-conducting spherical shell of inner radius a = 2.00 cm and outer radius b

Question:

In Figure a non-conducting spherical shell of inner radius a = 2.00 cm and outer radius b = 2.40 cm has (within its thickness) a positive volume charge density p = A/r, where A is a constant and r is the distance from the center of the shell. In addition, a small ball of charge q = 45.0fC is located at that center. What value should A have if the electric field in the shell (a