The number of turns in the coil of an ac¬ generator is 5000 and the area of the coil is  $0.25{\mathrm{m}}^2$. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2 $\mathrm{W}/{\mathrm{m}}^2$. The peak value of the emf generated is nearly 

• A

  786 kV

• B

  440 kV

• C

  220 kV

• D

  1570 kV