[单选题]
Suppose that you wis-d4 )ldp ar zjrkk/4-js 3;gthc nz 7h6g(qxq8h to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rh3ghnqc6 s;g 87x( tzqotating coil is $100 \; cm^{2}$, how many turns are needed?
