A series RC circuit is not switched on and the initial state charge of capacitance Uco = 20 V. In the circuit voltage source E= 50 V DC. Resistance R = 6 Q and capacitance C= 100 µF. E k dq dr R C= Give the answers to two decimal places. a) Give time constant Tau of circuit ms b) Calculate current after the switch k is closed at the moment t= 0.72 ms. A c) Calculate current after the switch k is closed at the moment t = 2*Tau. A

Let's say you measure t1/2 to be 0.037  seconds and the resistance in the circuit is 68  Ohms. Then what is the capacitance in micro Farads? Answer in micro Farads.

Okay for   Determine the mathematical expression for the voltage vC and the current iC for the discharge phase. I got Vc = 8e-t/0.2s V and iC = -4e-t/0.2mA But I need help with the last question Plot the waveforms of vC and iC for a period of time extending from 0to 2 s from when the switch was thrown into position 1.

An inductor is constructed by winding a coil of 100 turns around a magnetic core. The core is a cylinder with radius 0.5 cm and the core material has relative permeability of 1000. The coil covers a length of 10 cm. Determine the resulting inductance. Enter your answer in mH rounded to two decimal places.