This page connects the electric-field and magnetic-field amplitudes in one ideal electromagnetic wave. The numbers show that the shared wave speed is a model relationship between the two fields, while real field measurements would still carry calibration limits and uncertainty.
An ideal wave links electric and magnetic amplitudes through a fixed exact speed. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
The checked wave fields share one exact speed
The electromagnetic claim uses exact training values: 6 metres per second and 2 teslas produce a field of 12 volts per metre.