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Chapter 22: Q66PE (page 814)
How far from the starter cable of a car, carrying 150 A, must you be to experience a field less than the Earth鈥檚 ? Assume a long straight wire carries the current. (In practice, the body of your car shields the dashboard compass.)
Therefore, you must be a distance higher 0.600m .
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The wire carrying 400Ato the motor of a commuter train feels an attractive force ofdue to a parallel wire carrying to a headlight. (a) How far apart are the wires? (b) Are the currents in the same direction?
A 0.750-m-long section of cable carrying current to a car starter motor makes an angle of 60潞 with the Earth鈥檚field. What is the current when the wire experiences a force of localid="1653896077054" ? (b) If you run the wire between the poles of a strong horseshoe magnet, subjecting 5.00 cm of it to a 1.75-T field, what force is exerted on this segment of wire?
What current is needed in the solenoid described in Exercise 22.58 to produce a magnetic field times the Earth鈥檚 magnetic field of ?
Repeat Exercise 22.3 for a positive charge.
(a) Viewers of Star Trek hear of an antimatter drive on the Starship Enterprise. One possibility for such a futuristic energy source is to store antimatter-charged particles in a vacuum chamber, circulating in a magnetic field, and then extract them as needed. Antimatter annihilates with normal matter, producing pure energy. What strength magnetic field is needed to hold antiprotons, moving at\({\rm{5}}{\rm{.00 \times 1}}{{\rm{0}}^{\rm{7}}}{\rm{ m/s}}\)in a circular path\({\rm{2}}{\rm{.00 m}}\)in radius? Antiprotons have the same mass as protons but the opposite (negative) charge. (b) Is this field strength obtainable with today鈥檚 technology or is it a futuristic possibility?
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