The magnitude of the electric potential

A small charged sphere of radius a=1.10 cm is suspended by a nylon thread inside a larger neutral, conducting sphere. The larger sphere has an interior radius b=4.70 cm and is Δ=0.5 cm thick. The charge on the small sphere is q=0.90 nC. The two spheres are concentric and insulated from their surroundings. For the following questions, the origin of our coordinates is the center of the spheres. What is the magnitude of the electric potential at the outside surface of the larger sphere?

How much work is required to put a charge Q on the surface of a spherical ball of radius a?

How much work is required to put a charge Q on the surface of a spherical ball of radius a? Please give your answer as a formula, for example "k*Q*a/10000.0", and please use the symbol k instead of 1/(4πε0).

Voltage Across Resistor

Voltage Across Resistor. See attached file for full problem description.

Bode Plot

Bode Plot. See attached file for full problem description.

Currents

Currents. See attached file for full problem description.