with alternating current through the coil the lamp is bright because inductance is low before iron inserted into coil 1 of 3

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with alternating current through the coil the lamp is bright because inductance is low before iron inserted into coil see also B2XEGX with dc and B2XJHE with ac

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Keywords: 4mm, alternating, coil, current, experiment, inductance, iron, laboratory, lamp, physics, plug, power, rod, school, supply