(a) A metal bar of length 20 cm rotates with angular velocity 100 rpm about a pivot at one end. A uniform magnetic field 0.03 T is perpendicular to the plane of rotation. What is the potential difference between the ends of the bar?
(b) Figure 6 shows a 20 cm diameter loop rotating in a uniform 0.060 T magnetic field. What is the magnitude of the flux through the loop when the angle between magnetic field and normal to the loop is θ=0°, 30°, 60°, and 90°? If the loop has 50 turns and rotates with an angular velocity of 3000 rpm, what is rms value of the induced voltage in this coil?