Here are the capacitive reactance and inductive reactance,
respectively, for three sinusoidally driven series RLC circuits:
(1) 50 *, 100 *; (2) 100 *, 50 *; (3) 50 *, 50 *. (a) For each,
does the current lead or lag the applied emf, or are the two in
phase? (b) Which circuit is in resonance?