Answer to Question 4

A simple generator consists of 50 turns of wire mounted in a rectangular coil of radius 1.5 cm and length 4.0 cm. It is rotating at 20 revolutions every second in a field of flux density 0.14 T. Calculate the maximum emf. 
Formula: E_{0} = BANw A = 1.5 × 10^{2} m × 4.0 × 10^{2} m = 6.0 × 10^{4} m^{2}
w = 2pf = 2p × 20 Hz = 126 rad s^{1}
E_{0} = 0.14 T × 6.0 × 10^{4} m^{2} × 50 turns × 126 rad s^{1} = 0.53 V 