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A cylindrical bar magnet is placed along...

A cylindrical bar magnet is placed along the axis of a circular coil. If the magnet is rotated about that axis, will any current be induced in the coil?

Text Solution

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Since the bar magnet is cylindrical, its lines of force remain symmetric about its own axis. As a result, if the bar magnet is rotated about its own axis, i.e., with respect to the axis of the coil, the number of magnetic lines of force i.e., magnetic flux linked with the coil remains unchanged. So, no current will be induced in the coil.
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Knowledge Check

  • Magnetic field at a distance x along the axis of a short bar magnet is

    A
    inversely proportional to `x^(2)`
    B
    inversely proportional to `x^(3)`
    C
    proportional to the dipole moment of the magnet
    D
    twice the field at the same distance along perpendicular bisector of the axis of the magnet

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