Suppose that current flows to the left through the inductor in Fig. 21.6a so that i is negative.
(a) If the current is increasing in magnitude, what is the sign of Δi /Δt?
(b) In what direction is the induced emf that opposes the increase in current?
(c) Show that Eq. (21-8) gives the correct sign for vL.
(d) Repeat these three questions if the current flows to the left through the inductor and is decreasing in magnitude.

Transcribed Image Text:

E(t)