Sorry...I didn't even realize this thread had been posted. I thought it was obliterated when my computer froze, and I was too lazy to post again.
The plate didn't have a metal decorative edge. This is a possible explanation:
Microwave generate magnetoelectric wave that energise all dielectric
molecules, molecules that contain higher dielectric index will be energised
more those lower. For example, heating water is easiler than oil. Material
does not have dielectric index or very low index, will not be heated up
easily, such as glass. It is "transparrent" to microwave.
The heating of carrots is a localized boiling, or char because it contain
dielectric material at that particular part of carrot. So spark comes out as
it is over energised. Metal is not accepted to be used in microwave oven
unless the oven is specially made for that purpose.(It is available for
industrial or research purpose only.) This is why microwave heating is not
even as traditional heating that contains liquid as a media.
I found that
here
But the greenbeans weren't frozen...they were canned. Next time I'll just use water. :shrug:
