Answer
0.20 volts
Work Step by Step
The magnetic flux changes when the loop rotates. The angle between the field and the normal to the face of the loop changes from 0 degrees to 90 degrees. The magnitude of the average induced emf is calculated using equation 21–2a.
$$|\epsilon|=\frac{|\Delta \Phi_B|}{\Delta t}$$
$$=\frac{|\pi(0.0925m)^2(1.5T)(cos90^{\circ}-cos0))|}{0.20s}=0.20volts$$