A 19.7 k Ω resistor and a capacitor are connected in series and then a 12.0 V potential dissimilarity is suddenly applied across them. The potential dissimilarity across the capacitor rises to 6.62 V in 1.16 µs. (a) Compute the time constant of the circuit (in μs). (b) Discover the capacitance of the capacitor in nanofarads.