Figure 22.15a shows a permanent magnet approaching a loop

Chapter 22, Problem 22.21

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Figure 22.15a shows a permanent magnet approaching a loop of wire. The external circuit attached to the loop consists of the resistance R, which could represent the filament in a light bulb, for instance. In Figure 22.15a, what is the polarity of the induced emf? In other words, (a) is point A positive and point B negative or (b) is point A negative and point B positive?

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