8. What should be the diameter of a circular wire loop if it is to have a magnetic field of 0.15 T oriented perpendicular to its area which produces a magnetic flux of 1.2 x 10-2 Tm2? (0.32 m) 9. Acircular loop (radius 20 cm) is in a uniform magnetic field of 0.15 T. What angle(s) between the normal to the plane (the area vector) and the field would result in a flux with a magnitude of 1.4 x 10-2Tm?2? (42) 10. The plane of a conductive loop with an area of 0.020 m2 is perpendicular to a uniform magnetic field of 0.30 T. If the field drops to zero in 0.0045 s, what is the magnitude of the induced emf in the loop? (1.33 V) 11. The magnetic flux through one loop of wire is reduced from 0.35 Wb to 0.15 Wb in 0.20 s. If the average induced current in the coil is 10 A, what is the resistance of the wire? (0.10 Q) 12. When the magnetic flux through a single loop of wire increases by 30 Tm2, and average current of 40 A is induced in the wire. a. Assuming the wire has a resistance of 2.5Q, over what period of time did the flux increase? (0.30 s) b. If the current had only been only 20 A, how long would the flux increase have taken? (0.60 s) 13. A uniform magnetic field is at right angles to the plane of a wire loop. The field decreases by 0.20 T in 1.0 ms and the magnitude of the average emf induced in the loop is 80 V. a. What is the area of the loop? (0.40 m2) b. What would be the value of the average induced emf if the field change was the same but took twice as long to decrease? (40 V) c. What would be the value of the average induced emf if the field change was the same but took twice as long to decrease? (80 V)