Find the voltage across the capacitor as a function of time for t>0 for the circuit in Fig. 8.72. Assume steady-state conditions exist at 1=0 sa 1a 025 H 20 V Figure 8.72 For Prob. 8. 18. Chapter 8, Solution 18. When the switch is off, we have a source-free parallel RLC circuit. 1 2, 0.5 LC J0.25xl 2RC underdamped case V4 – 0.25 = 1.936 a<@, L(0) = (0) = initial inductor current = 20/5 = 4A VL0) = v(0) - initial capacitor voltage = o v (1) =e*(4, cosot+ A, sin w,t)=e® (4, cos1.936 + A, sin1.9361) v(0) =0 - A, dv -0.5)4, cos1.9361 + A, sin 1.936r)+e(-1.9364, sin 1.936r +1.9364, cos1.936 dt (V + RI RC dv(0) (0+4) --0.54, +1.936A, A --2.066 dt -LR = -(V++IR) Thus, %3D {1) =-2.066e sin 1.936t -0.50

Which of the following statements about equipment grounding conductors (EGCS) is true? A. The National Electrical Code permits the EGC to also perform as a grounding electrode conductor. B. More than one EGC must be used if multiple circuits are installed in a single raceway, cable, or cable tray. C. No current should be present in the EGC during normal operation. D. EGCs are required to be decreased in size to address voltage drop.

The wording that I am running into with questions such as "The number of conductors required to be installed between three-way and four-way switches is " is confusing.  The text is not expalining this in a way that I am understanding anything other than grounding conductor, which is optional unless I am using a metal box.  So what type of "conductor" is beng discussed?

Please answer in typing format