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Mathematics 7 Online
OpenStudy (anonymous):

A 60W lightbulb is designed to operate with an applied ac voltage of 130V rms. The bulb is placed in series with an inductor L, and this series combination is then connected to a 50Hz 220V voltage source. For the bulb to operate properly, determine the required value for L. Assume the bulb has resistance R and negligible inductance.

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