FIGURE 29-10
-A circular loop of wire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced emf is to be a maximum?

Question

FIGURE 29-10 
-A circular loop of wire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced emf is to be a maximum?

Quizplus · Accepted Answer

The induced emf is maximized when the plane of the loop is perpendicular to the magnetic field lines. For a uniform magnetic field pointing straight down, any horizontal orientation of the loop's axis of rotation will ensure that the plane of the loop is perpendicular to the field lines at some point during the rotation, maximizing the change in magnetic flux and thus the induced emf.

FIGURE 29-10 -A Circular Loop of Wire Is Rotated at Constant Angular