| A | B |
|---|
| The core of an electromagnet is usually made of what? | iron |
| A magnetic field exists around a wire when what happens? | current flows through the wire |
| The domains in an unmagnetized material that can be magnetized are aligned how? | in all directions |
| A device that converts mechanical energy into electric energy is what | an electric generator |
| If you cut a magnet in half, there will be how many south poles? | two |
| The strength of an electromagnet cannot be increased by what? | reversing the current |
| A moving electric charge does what? | creates a magnetic field |
| The lines of force around a magnet are strongest where? | at the poles (ends) |
| An electric current that flows back and forth in a circuit is a what? | alternating current |
| Magnetic force is exerted through what? | a magnetic field |
| Moving a magnet in and out of a coil of wire does what? | produces an electric current |
| If both coils of a transformer have thesame number of turns, the output voltage will be what? | sthe same compared to the input voltage |
| The aurora are produced when Earth's magnetic field interacts with what? | electrically charged particles |
| A compass needle will always align itself with what? | the field of a nearby strong magnet |
| The Sun emits what that stream through the solar system? | charged particles |
