Electrical Engineering ⇒ Topic : Magnetic field due to a current carrying conductor
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Gaurav
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MAGNETIC FIELD DUE TO A CURRENT CARRYING CONDUCTOR When an electric current flows through a wire, a magnetic field is built up around the wire itself. This can be seen using a cardboard, iron filings, and a current-carrying wire. 'When the wire passed through the cardboard and the current flowing, iron filings are sprinkled on to the cardboard,They can be seen arranging themselves in a magnetic field (Fig. a). The magnetic lines of force are referred to as flux. Just as in a natural magnet, the field is strongest near the wire and diminishes as the distance from the wire increases
fig. (a) Magnetic field around a wire that is carrying electric current Flux around a wire does have direction. Flux direction is determined by the direction of electron flow within the wire. As shown in Fig.(b), the North pole of the compass needle indicates the direction of flux or magnetic field around the wire. The dot in the centre of
Fig.(b) Compasses indicate the direction of flux around a wire the wire on the left indicates the joint the current-direction arrow corning toward the observe the X at the right represents the tail of the current arrow pointing away from the observer. If the direction of electron flow within the wire is reversed, the compass needles will reverse themselves, indicating a change in flux direction | |
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