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Chapter 29: The Magnetic Field

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Pages: 796 - 835

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116 Questions for Chapter 29: The Magnetic Field

  1. What currents are needed to generate the magnetic field strengths of Table 29.1 at a point role="math" localid="1649182206366" 1.0cm from a long, straight wire?

    Found on Page 830
  2. The element niobium, which is a metal, is a superconductor (i.e., no electrical resistance) at temperatures below 9K. How-ever, the superconductivity is destroyed if the magnetic field at the surface of the metal reaches or exceeds 0.10T. What is the maximum current in a straight, 3.0-mm-diam

    Found on Page 830
  3. Although the evidence is weak, there has been concern in re-cent years over possible health effects from the magnetic fields generated by electric transmission lines. A typical high-voltage transmission line is20m above the ground and carries a 200A current at a potential of110KV

    Found on Page 830
  4. What is the magnetic field strength at points 2 to 4 in FIGURE EX29.1? Assume that the wires overlap closely at 2 and 3 , that each point is the same distance from nearby wires, and that all other wires are too far away to contribute to the field.

    Found on Page 830
  5. The lightweight glass sphere in FIGURE Q29.1 hangs by a thread. The north pole of a bar magnet is brought near the sphere.

    Found on Page 829
  6. You have a horizontal cathode-ray tube (CRT) for which the controls have been adjusted such that the electron beam should make a single spot of light exactly in the center of the screen. You observe, however, that the spot is deflected to the right. It is possible that the CRT is broken. But as a clever scientist, you realize that your laboratory might be in either an electric or a magnetic field. Assuming that you do not have a compass, any magnets, or any charged rods, how can you use the CRT itself to determine whether the CRT is broken, is in an electric field, or is in a magnetic field? You cannot remove the CRT from the room.

    Found on Page 829
  7. A biophysics experiment uses a very sensitive magnetic field probe to determine the current associated with a nerve impulse traveling along an axon. If the peak field strength 1.0mmfrom an axon is 8.0pT

    Found on Page 830
  8. The magnetic field at the center of 1.0cmdiameter loop is 2.5mT.

    Found on Page 830
  9. The south pole of a bar magnet is brought toward the current loop of FIGURE Q29.11. Does the bar magnet attract, repel, or have no effect on the loop? Explain.

    Found on Page 829
  10. Give a step-by-step explanation, using both words and pictures, of how a permanent magnet can pick up a piece of non-magnetized iron

    Found on Page 829

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