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12 November, 21:46

A magnet is pushed into the center of a wire loop and then stops. what is the current in the wire loop when the wire stops moving? explain.

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  1. 12 November, 22:02
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    - - If the ends of the wire loop are open (not connected to anything)

    then there's never any current in it, no matter what you do with the

    magnet.

    - - If there's some kind of conductor between the ends of the wire

    loop, then

    - - While you're pushing the magnet, a current is flowing in the wire.

    The current creates a magnetic field around the wire, and some of

    the energy you're using to push gets stored in the magnetic field.

    - - When you stop pushing and the magnet stops moving, the energy

    stored in the magnetic field keeps the current flowing in the wire for

    a short time, and then everything stops.

    This all happens so fast, and lasts for such a short time, that you'd

    never notice it unless you were set up with special equipment to

    measure it.
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