A circular loop rotates at constant speed about an axle through the center of the loop. Figure Q25.6 shows an edge view and defines the angle \(\phi\), which increases from \(0^{\circ}\) to \(360^{\circ}\) as the loop rotates.

a. At what angle or angles is the magnetic flux a maximum?

b. At what angle or angles is the magnetic flux a minimum?. At what angle or angles is the magnetic flux changing most rapidly?

100 FIGURE Q25.6