An inductor (L = 80 mH) is subjected to a time- varying current according to the graph in Figure P21.69. Plot the corresponding emf as a function of time. What is the highest potential difference produced? What is the lowest? Assume the potential of the supply voltage is positive so that a decrease in current generates a positive voltage drop across the inductor.

 

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I (mA) 60 40 20 2.0 t (ms) 4.0 1,0 3,0 -20 -40 L Figure P21.69