Apologies if this has been answered before. I did search but couldn't find it... Imagine two fixed conducting parallel plates separated by 10cm of air. If an alternating voltage is applied to these at 10MHz an electric field produced between the two plates like a giant capacitor. Given that this is a time varying field is a magnetic field also produced? A supplementary question is whether or not you ave to have a loop to generate a magnetic field? - it is the example always shown in text books... Thanks to anyone who helps me try to get it!