An ac generator produces emf ~ = ~11l sin(wdt - 7T/4),

Chapter 31, Problem 67

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An ac generator produces emf ~ = ~11l sin(wdt - 7T/4), where ~111 = 30.0 V and Wd = 350 rad/s. The current in the circuit attached to the generator is i(t) = I sin(wdt + 7T/4), where 1= 620 mA. (a) At what time after t = 0 does the generator emf first reach a maximum? (b) At what time after t = 0 does the current first reach a maximum? (c) The circuit contains a single element other than the generator. Is it a capacitor, an inductor, or a resistor? Justify your answer. (d) What is the value of the capacitance, inductance, or resistance, as the case may be?

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