Alsalamu 3alikom w ra7matuo allah wa barakatu
Happy Eid Ad7a for all Muslims

I just want to know the difference between DC and AC relays regarding the method of making fields

i.e. we all know that AC current generates M.F. when it passes through Relay Coil but what for DC current? we all know that DC can't generate a field like AC does.

So, please i need an answer

Thanks,
Eng. Karim