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A 150 Ω resistor is connected in series with a 0.250 H inductor and an ac source. The voltage across the resistor is vR = (3.80 V)cos [(720 rad/s)t] .

(a) Derive an expression for the circuit current.

(b) Determine the inductive reactance of the inductor.

(c) Derive an expression for the voltage v_L across the inductor.

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