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Chapter 22: Q53PE (page 813)
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) Distance between the two wires .
(b) The currents are all going the same way .
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Repeat Exercise 22.3 for a positive charge.
A proton has a magnetic field due to its spin on its axis. The field is similar to that created by a circular to that created by a circular current loopm in radius with a current by a circular of A (no kidding ). Find maximum torque on a proton in a 2.50-T field. (This is a significant torque on a small particle.)
Find the direction and magnitude of the force that each wire experiences in \({\rm{Figure 22}}{\rm{.58}}\left( {\rm{b}} \right)\)using vector addition.
(a) A DC power line for a light-rail system carriesat an angle ofto the Earth鈥檚 field. What is the force on a section of this line? (b) Discuss practical concerns this presents, if any.
Volcanic and other such activity at the mid-Atlantic ridge extrudes material to fill the gap between separating tectonic plates associated with continental drift. The magnetization of rocks is found to reverse in a coordinated manner with distance from the ridge. What does this imply about the Earth鈥檚 magnetic field and how could the knowledge of the spreading rate be used to give its historical record?
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