Electromagnetic Induction

A ceiling fan having 3 blades of length \(80 \mathrm{~cm}\) each is rotating with an angular velocity of 1200 \(\mathrm{rpm}\). The magnetic field of earth in that region is \(0.5 \mathrm{G}\) and angle of dip is \(30^{\circ}\). The emf induced across the blades is \(\mathrm{N} \pi \times 10^{-5} \mathrm{~V}\). The value of \(\mathrm{N}\) is _________.