17. The magnetic flux through three different coils is changing as shown in Figure P21.17. For each situation, draw a corre- sponding graph showing quantitatively how the induced emf changes with time. Figure P21.17 (T m²) 0.4 0.2 0 t (s) (T• mỏ) 0.4 0 1 2 3 4 Þ(T•m²) +0.2 t (s) -0.2 Apro t(s) 12

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An electrical generator consists of a circular coil of wire of radius 2.50 cm and with 20 turns in the coil.  This coil rotates at a rate of 30 revolutions per second in a uniform magnetic field of strength 0.25 T.  What is the induced EMF (voltage) in this generator, averaged over  a quarter of a revolution (a 90o turn)? Question 1 options:   18.8 V   37.6 V   24.2 V   9.4 V

A uniform magnetic field is applied paralle to the axis of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.90 ̛. If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s, what is the magnitude of the emf induced in the coil? A) 16 V B) 12 V C) 9.2 V D) 7.2 V E) 5.4 V