Solenoid with Iron Bar

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“Place a strip of shet iron in the solenoid, as shown...Hotice that most of the lines of force are gathered into the iron and issue from its ends. Notice that the lines curve outward and tend to return, forming closed loops or complete magnetic circuits. Change the iron from the inside of the solenoid to the outside, and repeat...Notice that the iron again gathers in the lines of force as if it offered an easier path for them.” -Avery 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 469


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