Chapter 22: Q60PE (page 814)
What are the directions of the currents in the loop and coils shown in Figure 22.61?
In part (a): In a clockwise direction.
In part (b): As seen from the right, counter-clockwise.
In part (c): As seen from the left, counter-clockwise.
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If you have three parallel wires in the same plane, as in Figure 22.48, with currents in the outer two running in opposite directions, is it possible for the middle wire to be repelled by both? Attracted by both? Explain.
Question: A wire carrying acurrent passes between the poles of a strong magnet that is perpendicular to its field and experiences aforce on theof wire in the field. What is the average field strength?
Consider using the torque on a current-carrying coil in a magnetic field to detect relatively small magnetic fields (less than the field of the Earth, for example). Construct a problem in which you calculate the maximum torque on a current-carrying loop in a magnetic field. Among the things to be considered are the size of the coil, the number of loops it has, the current you pass through the coil, and the size of the field you wish to detect. Discuss whether the torque produced is large enough to be effectively measured. Your instructor may also wish for you to consider the effects, if any, of the field produced by the coil on the surroundings that could affect detection of the small field.
Which is more likely to interfere with compass readings, AC current in your refrigerator or DC current when you start your car? Explain.
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?
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