A coil of inductance 0.20 H and 1.0- resistance is connected to a constant 90-V source. At

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A coil of inductance 0.20 H and 1.0-Ω resistance is connected to a constant 90-V source. At what rate will the current in the coil grow 

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

(b) At the instant the current reaches two-thirds of its maximum value?

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