Please solve these questions in details and fully explainations. Thanks so much in advance.

2. In the figure two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have excess surface charge densities of opposite signs and magnitude 6.70 x 10-22 C/m?. What is the magnitude of the electric field at points (a) to the left of the plates, (b) to the right of them, and (c) between them? 3. In the figure a solid sphere of radius a = 2.40 cm is concentric with a spherical conducting shell of inner radius b = 2.00a and outer radius 0 = 2.40a. The sphere has a net uniform charge q1 = +3.91 fC; the shell has a net charge q2 = -q1. What is the magnitude of the electric field at radial distances (a)r = 0 cm, (b)r = a/2.00, (c) r = a, (d) r = 1.50a, (e)r = 2.30a, and (f)r = 3.50a? What is the net charge on the (g) inner and (h) outer surface of the shell