I know it is a lot but I really need help. I can't figure this out!

Circuit that I have attached has negligible internal resistance and capacitance us initially uncharged.

Explain what happens when the switch is closed to point A.

Sketch the current in the circuit as a function of time after the switch is closed.

Sketch the voltage across the capacitor as a function of time after the switch is closed.

What is the time constant for the circuit.

After 5 minutes the switch is switched to point B. Explain what happens in the circuit.

Sketch the current as a function of time after the switch is moved to position B.

Sketch the voltage across the capacitor as a function of time after the switch is moved to position B.

What is the voltage across the capacitor at a time 20msec.