845_Physics ProblemsTechnical Physics

845_Physics ProblemsTechnical Physics - loop though the...

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30 CHAPTER OUTLINE 30.1 The Biot-Savart Law 30.2 The Magnetic Force Between Two Parallel Conductors 30.3 Ampère’s Law 30.4 The Magnetic Field of a Solenoid 30.5 Magnetic Flux 30.6 Gauss’s Law in Magnetism 30.7 Displacement Current and the General Form of Ampère’s Law 30.9 The Magnetic Field of the 30.8 Magnetism in Matter Earth Sources of the Magnetic Field ANSWERS TO QUESTIONS Q30.1 It is not. The magnetic field created by a single loop of current resembles that of a bar magnet—strongest inside the loop, and decreasing in strength as you move away from the loop. Neither is it in a uniform direction—the magnetic field lines
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Unformatted text preview: loop though the loop! Q30.2 No magnetic field is created by a stationary charge, as the rate of flow is zero. A moving charge creates a magnetic field. Q30.3 The magnetic field created by wire 1 at the position of wire 2 is into the paper. Hence, the magnetic force on wire 2 is in direction down × into the paper = to the right, away from wire 1. Now wire 2 creates a magnetic field into the page at the location of wire 1, so wire 1 feels force up × into the paper = left, away from wire 2. FIG. Q30.3 185...
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