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Questions and Answers

What is a major advantage of superconductive magnets?

  • Inherently high signal-to-noise ratio (correct)
  • Low operating costs
  • Compact size and portability
  • Easier maintenance compared to resistive magnets
  • What is the typical field strength range for permanent magnets?

  • 0.06 to 0.35 Tesla (correct)
  • 0.3 to 0.6 Tesla
  • 0.5 to 1.5 Tesla
  • 1 to 2 Tesla
  • What is one of the main disadvantages of superconductive magnets?

  • High cost associated with acquisition and maintenance (correct)
  • Requirement of additional electricity for operation
  • Limited signal-to-noise ratio
  • Lower field strength compared to permanent magnets
  • What effect does an increase in amount of material have on permanent magnets?

    <p>Increases field strength (A)</p> Signup and view all the answers

    What defines a quench in the context of superconductive magnets?

    <p>Sudden loss of superconductivity and static field (C)</p> Signup and view all the answers

    What is the primary purpose of the static magnetic field (Bo field) in MRI?

    <p>To magnetize the tissue (C)</p> Signup and view all the answers

    Which type of magnetic material is weakly repelled from both poles of a magnetic field?

    <p>Diamagnetic (B)</p> Signup and view all the answers

    Which classification of magnets is characterized by natural properties?

    <p>Natural occurring magnets (B)</p> Signup and view all the answers

    What type of matter is unaffected by a magnetic field?

    <p>Nonmagnetic (A)</p> Signup and view all the answers

    What characterizes a bipolar or dipolar magnet?

    <p>They always have a north and south pole (A)</p> Signup and view all the answers

    Which type of magnetic property is associated with materials that are weakly attracted to a magnetic field?

    <p>Paramagnetic (B)</p> Signup and view all the answers

    Which of the following is NOT a classification of magnet?

    <p>Temporary magnets (D)</p> Signup and view all the answers

    What type of materials can be described as having weakly magnetic properties?

    <p>Lead and Gold (A)</p> Signup and view all the answers

    Which type of magnet has the ability to produce a magnetic field by passing an electric current through coils of wire?

    <p>Resistive magnets (D)</p> Signup and view all the answers

    What is the maximum magnetic field strength that resistive magnets can achieve?

    <p>Up to 0.3 Tesla (A)</p> Signup and view all the answers

    What material is mentioned as an excellent contrast agent for MRI?

    <p>Gadolinium (B)</p> Signup and view all the answers

    Which type of magnets requires cooling with liquid helium and liquid nitrogen to reduce electrical resistance?

    <p>Superconductive magnets (B)</p> Signup and view all the answers

    What is the smaller unit of measurement for the strength of a magnetic field?

    <p>Gauss (B)</p> Signup and view all the answers

    What is a unique feature of resistive magnets compared to superconductive magnets?

    <p>They can be turned off when not in use (A)</p> Signup and view all the answers

    How does a resistive magnet produce a static magnetic field?

    <p>By direct current (D)</p> Signup and view all the answers

    Which of the following statements about permanent magnets is true?

    <p>They retain magnetization without external power (D)</p> Signup and view all the answers

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