A simple series circuit consists of a 150 resistor, a 25 V battery, a switch, and

A simple series circuit consists of a 150 Ω resistor, a 25 V battery, a switch, and a 2.5 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.