Suppose that current flows to the left through the inductor in Fig. 21.7a so that i is

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Suppose that current flows to the left through the inductor in Fig. 21.7a 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. (21-22) gives the correct sign for vL.

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