Find the frequency of rotation of the rectangular frame and the number of turns N = 20 in a magnetic field with induction

Find the frequency of rotation of the rectangular frame and the number of turns N = 20 in a magnetic field with induction B = 0.5 T, if the amplitude of the induced EMF is E = 10V. The area of the frame is 200 cm squared.

We solve using this formula:
Em = N * B * S * w
w = Em / N * B * S = 10/20 * 0.5 * 200 * 10 ^ -4 = 50 (rad / s).
v = w / 2 * pi = 50 / 6.28 = 7.96 = 8 (rev / s).
Answer: 8 rev / s.