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PS chapter 11
Physical Science Chapter 11 on magnetism
| Question | Answer |
|---|---|
| The ancient Greeks found these magnetic objects | Loadstones |
| What magnetic objects always have | North and South poles |
| Molecular structures that form magnets | Magnetic dipoles |
| If you cut a magnet in half you will get | two smaller magnets |
| What can magnets be divied down to | Microscopic sizes |
| Magnetism is a | field force |
| The closer the field lines are | the stronger the force is. |
| What is the "test charge" for a magnet | a tiny compass |
| Field lines go from _____ to ______ | North; South |
| ______ magnetic poles attract | opposite |
| ______ magnetic poles repel | same |
| Ferromagnetic materials | are strongly attracted to magnets |
| Paramagnetic materials | are slightly attracted to magnets |
| A group of magnetic dipoles pointing in the same direction form a | domain |
| In unmagnetized objects domains are | randomly alligned |
| When a object is magnetized | the domains allign |
| ______ increases with temperature increase | particle motion |
| What is the temperature at which a material looses its magnetic properties | Curie temperature |
| Conventional current flows | opposite of electrons |
| A solenoid is | a coil of wire that acts like a magnet |
| A electromagnet is | a coil of wire with a bar magnet in the middle |
| Electric currents produce | magnetic fields |
| Magnetic fields produce | electric current |
| Increaseing the number of coils and speed will increase the current in a | electromagnet |
| Magnetic fields influence the motion of | electrical charges |
| A magnetic field that is unchanging is producing | no current |
| Electrical generators convert ____ into ______ | rotational mechanical energy; electrical energy |
| A ____ is produced by generators | alternating current |
| A turbine converts the energy of ____ into rotational motion | moving fluid |
| Motors change _______ into _______ | electrical energy; rotary mechanical rotation |