Switching off is a different issue where the collapsing magnetic field causes a surge.
I strongly suggest you 'scope the current through such a coil and you will see a spike when power is applied. A small one maybe, but a spike nonetheless.
Switching off is a different issue where the collapsing magnetic field causes a surge.
I strongly suggest you 'scope the current through such a coil and you will see a spike when power is applied. A small one maybe, but a spike nonetheless.