Take a magnetic needle NS, which can rotate freely about a
vertical axis in horizontal plane. Hold a conducting wire AB over the magnetic
needle NS parallel to it. Complete the circuit by closing the key such that
current flows from A to B.
It is found that N-pole of the magnetic needle gets deflected the
west. If the direction of current in the wire is reversed (i.e. from B to A),
the N-pole of magnetic needle gets deflected towards east. Since magnetic
needle can be deflected by another magnetic field therefore current in the wire
must be producing a magnetic field in the surrounding space.
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