• 2022-06-06
    If the magnetic field B through
    a loop of wire is increasing, the
    induced magnetic field will be
    A: in
    the same direction as B
    B: in
    the opposite direction as B
    C: perpendicular
    to B
    D: at
    an acute angle to B
    E: there
    is no induced magnetic field
  • B
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    • 0

      The magnetic field lines are ( ) curves,The<br/>outer space magnetic field line of the permanent magnet is ( <br/>). <br/>A.close-loop/ A: ). <br/>close-loop/<br/>from B: pole<br/>open-loop/<br/>from C: pole<br/>close-loop/<br/>from D: pole to E: pole to F: pole to G: pole to H: pole<br/>open-loop/<br/>from I: pole

    • 1

      A circular loop of wire is held in a uniform magnetic field, with the plane of the loop perpendicular to the field lines. Which of the following will not cause a current to be induced in the loop? A: crushing the loop B: rotating the loop about an axis perpendicular to the field lines C: keeping the orientation of the loop fixed and moving it along the field lines D: pulling the loop out of the field

    • 2

      Which of the following explains why a magnetic field does no work on a moving charged particle?( ) A: The magnetic force depends on the speed of the particle. B: There is always an electric field that cancels the work done by the magnetic field. C: The magnetic force is always perpendicular to the direction of motion. D: The magnetic force depends on the direction of motion of the particle. E: The magnetic force is conservative.

    • 3

      When the medium is magnetized, the molecular magnetic moment inside the paramagnetic material turns to the opposite direction of the external magnetic field

    • 4

      There exists an induced current flowing clockwise in the conducting loop shown in Figure. What is the direction of the magnetic field through the loop and how does the field vary in magnitude?[img=111x83]1803a3760763dd5.png[/img] A: Into the page and increasing. B: Into the page and decreasing. C: Into the page and steady. D: Out of the page and decreasing.