5. Consider a solenoid of 90 turns with unknown radius, r. The solenoid is subjected to a magnetic field of 0.012 T. The axis of the solenoid is parallel to the magnetic field. When the field is uniformly increased to 1.2 Tover a period of 0.2 minutes an emf with a magnitude of -0.8 V is induced. What the radius of the solenoid. a) 0.0286m b) 0.0286cm c) 0.169cm d) 0.169m 6. Consider a circular coil of 16 turns with radius 3 cm. The solenoid is subjected to a varying magnetic field that changes uniformly from 0.9 T to 9.9 T in an interval of 21s. The axis of the solenoid makes an angle of 45 to the magnetic field. Find the induced emf. a) 137V b) 0.13701V c) 137.01mV d) 13.701mV