File talk:External Inductor Type Induction Lamp Dwg.jpg

Dear L. Michael Roberts, had you ever learned at a high school? Open any physics book and watch how the bloody magnetic field is directed. In the figure you drawn this field would be directed along the circular magnetic core, and almost all field would be contained inside this core, so there would almost no magnetic and therefore electric field in the gas discharge tube.

And if you weave the coil around all the extent of the core (as i can understand you imply), you will get exactly zero field in the tube and therefore zero light output.Обедающий философ (talk) 15:40, 16 December 2010 (UTC)

The direction of magnetic field is wrong. Magnetic field should be confined inside the magnetic core and in the direction perpendicular to the cross section of the core. It is the same case even if the coil spans the entire circumferance of the core or a small portion due to the fact that magnetic material of the core have relative permeability 1000-3000 times greater than that of air. But there will be electric field inside the tube due to induction caused by the varying magnetic field (Faraday's law) 14.139.128.12 (talk) —Preceding undated comment added 17:02, 3 April 2012 (UTC).