Solve this:
Q.48. A rectangular coil of 300 turns has an average area of 25 cm $\times$ 10 cm. The coil rotates with a speed of 50 cps in a uniform magnetic field of strength 4 $\times {10}^{-2} T$ about an axis perpendicular to the field. The peak value of the induced emf is (in volt)
1) 3 $\mathrm{\pi }$
2) 30 $\mathrm{\pi }$
3) 300 $\mathrm{\pi }$
4) 3000 $\mathrm{\pi }$