Homework, 11 General Physics

Homework, 11 General Physics - General Physics II Homework...

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General Physics II Homework 11 Worked Examples Giancoli: 21.3, 21.11, 21.14, 21.18, 21.24 3. As the magnet is pushed into the coil, the magnetic flux increases to the right. To oppose this increase, flux produced by the induced current must be to the left, so the induced current in the resistor will be from right to left. 11. ( a ) The average induced emf is given by Eq. 21-2a. ( b ) The positive result for the induced emf means the induced field is away from the observer, so the induced current is clockwise. 14. ( a ) The velocity is found from Eq. 21-3. ( b ) Because the outward flux is increasing, the induced flux will be into the page, so the induced current is clockwise. Thus the induced emf in the rod is down, which means that the electric field will be down. The magnitude of the electric field is the induced voltage per unit length.
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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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