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A changing electric current in a coil of wire will induce a voltage in a nearby coil. Important in the design of transformers, the effect is called mutual inductance. For two coils, the mutual inductance (in H) as a function of the distance between them is given in the following table:

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Distance (cm) M. ind. (H) 2.0 4.0 0.0 0.77 0.75 6.0 8.0 10.0 12.0 0.61 0.49 0.38 0.25 0.17