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Chapter 22: Q65PE (page 814)
What current is needed in the solenoid described in Exercise 22.58 to produce a magnetic field times the Earth’s magnetic field of ?
The current required in a 10,000 turn solenoid to generate times Earth's magnetic field is 39.8A .
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(a) A 0.750-m-long section of cable carrying current to a car starter motor makes an angle of 60º with the Earth’s field. What is the current when the wire experiences a force of ? (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?
Discuss the possibility that a Hall voltage would be generated on the moving heart of a patient during MRI imaging. Also discuss the same effect on the wires of a pacemaker. (The fact that patients with pacemakers are not given MRIs is significant.
Repeat Exercise for a negative 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’s technology or is it a futuristic possibility?
(a) A physicist performing a sensitive measurement wants to limit the magnetic force on a moving charge in her equipment to less than. What is the greatest the charge can be if it moves at a maximum speed ofin the Earth’s field? (b) Discuss whether it would be difficult to limit the charge to less than the value found in (a) by comparing it with typical static electricity and noting that static is often absent.
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