If the switch in RC-circuit, shown beside, is closed at t=0 to charge initialy uncharged capacitor, see Figure, find: Q12. The time constant of the circuit (in ms): A) 12.0 B) 19.6 C) 13.2 D) 16.8 E) 10.8 ww R=4ks wwww HH C=5.5 μF R = 6 k E=8V Q13. The instant (t) of time (in ms) at which the potential across the capacitor equals the potential difference across the resistor 4 k.: A) 7.48 B) 8.32 C) 11.64 D) 5.73 E) 9.15