A ceiling fan having 3 blades of length 80cm each is rotating with...

Component of the magnetic field perpendicular to the plane of fan blades, ${B}_{v} = Bsin30 ° = \left(0 . 5 \times {10}^{- 4}T\right) \times \dfrac{1}{2} = \dfrac{1}{4} \times {10}^{- 4}T$

Angular frequency, $\omega = 2\pi \times f = \dfrac{2\pi}{60} \times 1200rad{s}^{- 1} = 40\pi rad{s}^{- 1}$

Therefore, induced EMF

$ε = \dfrac{1}{2}{B}_{V}\omega{l}^{2} = \dfrac{1}{2} \times \left(\dfrac{1}{4} \times {10}^{- 4}\right) \times 40\pi \times {\left(0 . 8\right)}^{2}$

$= 32\pi \times {10}^{- 5}V$