An ac generator produces emf E = E m sin(?dt – p/4), where E m = 30.0 V and ?d= 350 rad/s. The current in the circuit attached to the generator is i(t) = I sin(?dt + p/4), where I = 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?