Rotating Conductors and Generators

A spoke of radius 0.85 m rotates at 140 rad s⁻¹ in a 0.18 T field perpendicular to the wheel (9702/42/O/N/24 Q1(b)(ii)–(iv)).

1. Find the period of one revolution.
   $$T=\dfrac{2\pi}{140}=0.045\ \mathrm{s}$$
2. Find the flux cut in one revolution.
   $$\Phi=B\pi R^2=0.41\ \mathrm{Wb}$$
3. Divide the flux cut by the period.
   $$|\mathcal E|=\dfrac{0.41}{0.045}$$