enCR3
voltage: a transformer can step up _______.
magnetic field: the magnetic effect of electric currents and magnetic materials.
reversed: when the dry cell terminals of an electromagnet are reversed, the N-and S-poles will also be ______.
1
2
3
Across:
3.
the magnetic effect of electric currents and magnetic materials.
Down:
1.
when the dry cell terminals of an electromagnet are reversed, the N-and S-poles will also be ______.