Re: Will touching a magnet on waveguide cover in microwave cause microwaves?

I do not think that it is possible to cause microwaves to be produced just by 
holding a magnet near the waveguide or magnetron.  Typically, a fairly large 
amount of power is needed to produce microwave energy.  Additionally, using a 
magnet is not a reliable method to determine if something is a metal.  
Conventional magnets are attracted to iron.  There are pure metals that do not 
contain iron; for example -- copper and aluminum.  Alloy metals, such as brass 
(copper and zinc) or bronze (copper and tin) also do not contain iron.