[单选题]
You are designing a generator with a y/9m9f:dnj7rc ou2 z wmaximun 5ok-l+ ftgqrnby5iot /q4,3m $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?
A. $7.1 \; Hz$
B. $7.5 \; Hz$
C. $8.0 \; Hz$
D. $44 \; Hz$
