[EricH]

The latch would be moving under the influence of the electromagnet, wouldn't it?

The Q&A has dealt with several questions on electromagnets.
http://forums.usfirst.org/showthread.php?t=13979
http://forums.usfirst.org/showthread.php?t=14121 Note that this one outlaws any use of electromagnets to provide motion.
http://forums.usfirst.org/showthread.php?t=14093

Due to the second response linked (there are more than 3 out there, trust me), if you're moving the ram with the electromagnet, you are in violation of the rules. By the looks of things, the latch is activated by the electromagnet, making it illegal per <R53> as interpreted by the Q&A.