An electric current in a conductor produces a magnetic field. This magnetic field is composed of lines of force. A looped conductor, such as the one in the diagram above. Has circular lines of force. Similarly, a straight conductor has circular lines force, but a much weaker magnetic field. A coiled conductor, such as a coil or a solenoid. Has a much stronger magnetic field than a looped conductor or straight conductor. This is because the lines of force pass through it.
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