Compare the magnetic flux patterns of a bar magnet and a straight current-carrying conductor. What needs to be done to a straight current-carrying conductor so that the conductor flux replicates the flux of a bar magnet?
What will be an ideal response?
Unlike a bar magnet, a straight current-carrying conductor has no poles. As soon as the same conductor is arranged as a loop, it takes on the polar characteristics of a magnet. By adding additional loops, also called turns, a coil is formed. The magnetic field produced in the vicinity of the coil is like that of a bar magnet. The end of the coil where the flux emerges has the properties of a N pole. Flux reenters at the other end of the coil, so this end has the properties of a S pole. (The magnetic polarity of the coil is determined by placing the fingers of the left hand in the direction of current (electron movement) as it exists through the turns of wire. The thumb will point in the direction of the N pole.)
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