Hi! I need to do this question but I'm not sure how. An explanation of the process would be much appreciated!
A simple series circuit consists of a 150 Ω resistor, a 29 V battery, a switch, and a 2.1 pF parallel-plate capacitor (initially uncharged) with plates 5.0 mm apart. The switch is closed at t = 0 s.
(a) After the switch is closed, find the maximum electric flux and the maximum displacement current through the capacitor.
(b) Find the electric flux and the displacement current at t = 0.50 ns.

Question

Hi! I need to do this question but I'm not sure how.  An explanation of the process would be much appreciated!
 A simple series circuit consists of a 150 Ω resistor, a 29 V battery, a switch, and a 2.1 pF parallel-plate capacitor (initially uncharged) with plates 5.0 mm apart. The switch is closed at t = 0 s. 
 (a) After the switch is closed, find the maximum electric flux and the maximum displacement current through the capacitor.
 (b) Find the electric flux and the displacement current at t = 0.50 ns.

anonymous · Answer

We know that the capacitor will charge over time as

q = C V [1-exp(-t/RC)],
slowly reaching saturation.

I = q per time = (V/R) exp(-t/RC)  current,
deceasing exponentially as the charge builds up..

That should help.