A ceiling fan having 3 blades of length 80 cm each is rotating with an angular velocity of 1200 rpm. The magnetic field of earth in that region is…

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