The switch in the circuit in Fig. P7.42 has been closed for a long time.A student
Chapter 7, Problem 7.42(choose chapter or problem)
The switch in the circuit in Fig. P7.42 has been closed for a long time.A student abruptly opens the switch and reports to her instructor that when the switch opened, an electric arc with noticeable persistence was established across the switch, and at the same time the voltmeter placed across the coil was damaged. On the basis of your analysis of the circuit in Problem 7.41, can you explain to the student why this happened?
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