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An investigation of trans-circuit induction is reported herein. Wire-to-wire induction between parallel wires was set up and energized by a.c. power of nominal potential, 110 (V) rms. The data analysis resulted in a reasoned explanation, appropriate equations for trans-circuit induction, and an evaluation of the maximum reach of the magnetic field.

To ascertain the reach of a magnetic field, equations were found for energy density in the field, a spatial accounting of its internal energy was made, and used to estimate the radius of an outer boundary for the field. If the Biot-Savart law is valid, the test field considered herein, can reach no further than about 70 (cm) from the current section which raised it, regardless of current magnitude.