Variable inductor

Posted on Feb 6, 2014

Wrap hundreds of turns of magnet wire around the paper tube. Connect this home-made inductor in series with an AC power supply and lamp to form a circuit. When the tube is empty, the lamp should glow brightly. When the steel bar is inserted in the tube, the lamp dims from increased inductance (L) and consequently increased inductive reactance (XL). Try using bars of different materials, such as copper and

Variable inductor
Click here to download the full size of the above Circuit.

stainless steel, if available. Not all metals have the same effect, due to differences in magnetic permeability.

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