Answer to Question 4

 

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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:

E0 = BANw

A = 1.5 10-2 m 4.0 10-2 m = 6.0 10-4 m2

 

w = 2pf = 2p 20 Hz = 126 rad s-1

 

E0 = 0.14 T 6.0 10-4 m2 50 turns 126 rad s-1 = 0.53 V