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Chapter 23: Q19PE (page 860)
At what speed must the sliding rod in Figure 23.11move to produce an emf of 1.00 Vin a 1.50 Tfield, given the rod鈥檚 length is 30.0 cm?
The obtained speed is: 2.22 m/s.
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Make a drawing similar to Figure \({\rm{23}}{\rm{.14}}\), but with the pendulum moving in the opposite direction. Then use Faraday鈥檚 law, Lenz鈥檚 law, and \({\rm{RHR - 1}}\) to show that magnetic force opposes motion.
A person who works with large magnets sometimes places her head inside a strong field. She reports feeling dizzy as she quickly turns her head. How might this be associated with induction?
When a magnet is thrust into a coil as in Figure 23.4(a), what is the direction of the force exerted by the coil on the magnet? Draw a diagram showing the direction of the current induced in the coil and the magnetic field it produces, to justify your response. How does the magnitude of the force depend on the resistance of the galvanometer?
The source of a generator鈥檚 electrical energy output is the work done to turn its coils. How is the work needed to turn the generator related to Lenz鈥檚 law?
(a) A jet airplane with a 75.0 mwingspan is flying at 280 m /s. What emf is induced between wingtips if the vertical component of the Earth鈥檚 field is? (b) Is an emf of this magnitude likely to have any consequences? Explain.
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