A uniformly charged ball of radius a and charge Q is at the center of a hollow metal shell with inner radius b and outer radius c. The hollow sphere has net charge +4Q.
1) Decide the electric field strength in the region r? a.
2) Determine the electric field strength in the region a
3) Determine the electric field strength in the region b? r? c.
4) Decide the electric field strength in the region c