ocr: COIL OF WIRE - - - MAGNETIC - 00 - - FIELD - - CURRENT IREVEIRSE CURRENT Ifyou wind a current-carrying wire into a coil, you concentrate the magnetic field. The lines of force combine to form a field similar to that ofa bar magnet, with the poles at either end of - the coil. Ifyou place an iron bar at the center of the coil, the effect 1S stronger.
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