Physics for Scientists and Engineers 8ed - ch34 - end of chapter questions

Physics for Scientists and Engineers 8ed - ch34 - end of chapter questions

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Questions W denotes answer available in Student SolutionsManual/Study Guide; O denotes objective question 1. What new concept did Maxwell’s generalized form of Ampère’s law include? 2. Do Maxwell’s equations allow for the existence of magnetic monopoles? Explain. 3. Radio stations often advertise “instant news.” If that means you can hear the news the instant the radio announcer speaks it, is the claim true? What approximate time interval is required for a message to travel from Maine to California by radio waves? Assume the waves can be detected at this range. 4. When light (or other electromagnetic radiation) travels across a given region, what is it that oscillates? What is it that is transported? 5. If a high-frequency current exists in a solenoid containing a metallic core, the core becomes warm due to induction. Explain why the material rises in temperature in this situation. 6. O A student working with transmitting apparatus like Heinrich Hertz’s wishes to adjust the electrodes to generate electromagnetic waves with a frequency half as large as before. (i) How large should she make the effective capacitance of the pair of electrodes? (a) 4 times larger than before (b) 2 times larger than before (c) 1 2 as large as before (d) 1 4 as large as before (e) None of these answers would have the desired effect. (ii) After she makes the required adjustment, what will the wavelength of the transmitted wave be? (a) 4 times larger than before (b) 2 times larger than before (c) the same as before (d) 1 2 as large as before (e) 1 4 as large as before (f) None of these answers is necessarily true. 7. O Assume you charge a comb by running it through your hair and then hold the comb next to a bar magnet. Do the electric and magnetic fields produced constitute an electromagnetic wave? (a) Yes they do, necessarily. (b) Yes they do because charged particles are moving inside the bar magnet. (c) They can, but only if the electric field of the comb and the magnetic field of the magnet are perpendicular. (d) They can, but only if both the comb and the magnet are moving. (e) They can, if either the comb or the magnet or both are accelerating. 8. O A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. (i) As the wave moves, does its frequency (a) increase, (b) decrease, or (c) stay constant? Answer the same question about (ii) its wavelength, (iii) its speed, (iv) its intensity, and (v) the amplitude of its electric field. 9. O A plane electromagnetic wave with a single frequency moves in vacuum in the + x direction. Its amplitude is uniform over the yz plane. (i) As the wave moves, does its frequency (a) increase, (b) decrease, or (c) stay constant? Answer the same question about (ii) its wavelength, (iii) its speed, (iv) its intensity, and (v) the amplitude of its magnetic field. 10.
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Physics for Scientists and Engineers 8ed - ch34 - end of chapter questions

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