GO An ac generator produces emf ℰ = ℰm sin(ωdt – π/4), where ℰm = 30.0 V and ωd = 350rad/s. The current in the circuit attached to the generator is i(t) = I sin(ωdt + π/4), where t = 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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