Can the coil of the solenoid valve be pulled out from the iron core? Why? What is the difference between AC coil and DC coil?

Can the coil of the solenoid valve be pulled out from the iron core? Why? What is the difference between AC coil and DC coil?

The magnetic force of the solenoid valve coil is related to the wire diameter and number of turns of the coil and the magnetic permeability area of ​​the magnet, that is, magnetic flux. The DC electromagnetic coil can be pulled out from the iron core;the AC electromagnetic coil cannot be pulled out from the iron core, which will cause the coil current to surge and burn the coil. There is a short-circuit ring inside the AC coil core to reduce vibration. There is no need for a short-circuit ring inside the DC coil core.