Question: 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

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 Î”i /Î”t?
(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.

E(t)

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