A coil of resistance 15 and inductance 0.60 H is connected to a steady 120-V power

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A coil of resistance 15 Ω and inductance 0.60 H is connected to a steady 120-V power source. At what rate will the current in the coil rise 

(a) At the instant the coil is connected to the power source, and 

(b) At the instant the current reaches 80 percent of its maximum value?

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