How does a microwave break a porcelain plate?

[highwaystar101]

Kasz216 said:

highwaystar101 said:
Is your microwave plate rotating? Because uneven heating (as Happysquirrel beat me too *shakes fist*) can cause a porcelain plate to crack. If the plate wasn't rotating then it would have been heated unevenly. It could have happened through temporary obstruction or a broken motor.

Makes sense actually.  The place i moved into had a microwave but the rotater is broken.

 

Then I would imagine that a broken rotator is most likely to be the reason it cracked.