If the magnet to 12 V DC voltage applying (on my switching power supply is 13.8V), I can make a magnetic effect. However, this is disappointingly low! Never 500N, maybe 50N, 25N more. I have a 8cm long permanent magnet, which is considerably stronger.
When the magnet would come from the EU, I would have sent him back. So he ends up in a drawer. I'm disappointed.