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Predict the direction of induced current...

Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f).

Text Solution

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The direction of the induced current in a closed loop is given by Lenz’s law. The given pairs of figures show the direction of the induced current when the North pole of a bar magnet is moved towards and away from a closed loop respectively.

Using Lenz’s rule, the direction of the induced current in the given situations can be predicted as follows:
(a) The direction of the induced current is along qrpq.
(b) The direction of the induced current is along prqp.
(c) The direction of the induced current is along yzxy.
(d) The direction of the induced current is along zyxz.
(e) The direction of the induced current is along xryx.
(f) No current is induced since the field lines are lying in the plane of the closed loop.
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Knowledge Check

  • Use Lenz's law to determine the direction of induced current in the situation described by Fig. (a) a wire irregular shape turning into a circular shape (b) a circular loop being deformed into a narrow straight wire. The across indicate the magnetic field into the paper and the dots indicate magnetic field out of the paper.

    A
    along abcda
    B
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    C
    into the plane of the paper
    D
    out of the plane of the paper

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