Transformers use steady magnetic fields to produce an emf in the secondary windings. true or false?

That's false.  You only get an emf on the secondary side when the
magnetic field of the primary winding is CHANGING. 

If an unchanging voltage is applied to the primary winding, then
no emf is induced in the secondary winding.  Still, it's not quite
correct to say that nothing comes out of the transformer ...
applying a constant voltage to the primary winding is a good way
to get SMOKE out of it.

Iwould sure like to answer your question but i honestly just don’t know