The magnet in the orbit will be stopped as well.

Energie is simple. The energie you put in you will get out. Now remember that!

If you raise a stone for two meters. You put potential energie into the stone. When you release the stone, he will produce the same amount energy when he drops and collides with the ground (position change (movement), heat and deforming) as you put into lifting the stone (you need also energie to bring your arm into that position).