Question

Question 20. The answer is wrong

A rectangular coil with sides 0.130 m by 0.230 m has 487 turns of wire. It is rotated about its long axis in a uniform magnetic field of 0.520 T that is perpendicular to the long axis. At what frequency, in complete cycles per second, must the coil be rotated for it to generate a maximum voltage of 115 V?

Answer 1

area of the coil, A=0.13*0.23 m^2

no of turns, N=487

magnetic field, B=0.52T

emf=115 v

use,

emf=N*B*A*w

115=487*0.52*(0.13*0.23)*(2pi*f)

===> f=2.417 Hz

frequency f=2.42 Hz