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How can it be shown that a magnetic fiel...

How can it be shown that a magnetic field exists around a wire through which a direct current is passing?

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A compass needle placed near the wire, through which current is flowing, gets deflected, thereby showing the magnetic field around it.
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Knowledge Check

  • The strength of the magnetic field around a long straight wire, carrying current, is

    A
    inversely proportional to the distance from the wire
    B
    inversely proportional to the square of the distance from the wire
    C
    directly proportional to the square of the distance
    D
    directly proportional to the distance from the wire

  • The magnetic field produced around a straight line wire when current flows through it is

    A
    parallel to the wire.
    B
    perpendicular to the wire.
    C
    in the form of concentric circle.
    D
    parabolic line.

  • The direction of the magnetic field around a straight conductor carrying current is given by …………..

    A
    the right hand thumb rule
    B
    Fleming's left hand rule
    C
    Fleming's right hand rule
    D
    none of these

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    The direction of the magnetic field around a straight conductor carrying current is given by ……………… .

    A wire carrying current l, bent in the form of a quarter circle is held at rest on a smooth table with two threads as shown. A uniform magnetic field exists in the region direction into the plane select the correct alternatives

    State Right-Hand Thumb Rule to find the direction of magnetic field around a straight conductor carrying current. How will this magnetic field be affected on: (a) increasing the current through the conductor, (b) changing the direction of flow of current through the conductor?

    Find the magnitude and direction of magnetic field at point P due to the current carrying wire as shown in

    The direction of magnetic field at a point due to an infinitely long wire carrying current is

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