[单选题]
Suppose that you wish to construx 66k6 cgler,ict a simple AC generator with an output of 12 V e g6kl6ci6x, rcg:;rhdn3t8 bmaximum when rn8 rgdcb:th;3 otated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?
