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**Unformatted text preview: **18. ( a ) There is an emf induced in the coil since the flux through the coil changes. The current in the coil is the induced emf divided by the resistance of the coil. The resistance of the coil is found from Eq. 18-3. ( b ) The rate at which thermal energy is produced in the wire is the power dissipated in the wire. 24. ( a )The rms voltage is found from the peak induced emf. The peak induced emf is calculated from Eq. 21-5. ( b ) To double the output voltage, you must double the rotation frequency to 240 rev/s. Problems Giancoli: 21.8, 21.15, 21.16, 21.19, 21.25 Notes: Study and understand problem 3 on page 150 and the three problems on page 161 and then rewrite your own detailed solutions for them....

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