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Chapter 11 Magnets
Chapter 11A-11.7
| Question | Answer |
|---|---|
| The ancient Greeks found___, which baffled them with their strange ability to attract and hold iron pieces. | lodestones |
| magnetic objects have a __ and __ magnetic pole | north and south |
| the poles are called___ ___ | magnetic dipoles |
| if you cut a magnet in half, you will end up with __ ___ ___ | two smaller magnets |
| each will have a north and south __ ___ | magnetic pole |
| Scientists have found that even when magnets are ___ as many times phisically possible, each of the ____ ____ has both a north and south magnetic pole | divided microscopic freagments |
| even the ____ structures that form magnets exhibit a ____ ____ | magnetic dipole |
| magnetism is a ___ ___ | field force |
| a __ ___ can be modeled using ____ lines of force, which are similar to an electric field's lines of force | magnetic field; magnetic |
| magnetic lines of force are modeled as ___ loops both within a magnetized object as well as in the ___ around it | continuous; space |
| the direction of the field line is determined by | the direction a tiny compass would point if inserted into the field |
| magnetic field lines point ___ from the north magnetic poles and toward ___ magnetic poles | away; south |
| the distance between field lines indicates the __ of the field at that point | strength |
| Law of Magnetism | opposite magnetic poles attract; like magnetic poles repel. |
| Magnets strongly attract to ____ materials | ferromagnetic; examples- iron, nickel |
| Some materials only ___ attract to magnets. these are called ___ materials | slightly; paramagnetic; examples- aluminum, sodium |
| Large groups of magnetic dipoles automatically align in the same directions to form microscopic regions called ___ | domains |
| in unmagnetized ferromagnetic materials the magnetic directions of the domains are oriented ___, so their magnetic forces ___ each other | randomly; cancel |
| when an external magnetic field is applied the domains ___ to form a permanent magnet | align |
| the atoms of a paramagnetic maerials don't reside in __ and are ___ oriented | domains; randomly |
| a paramagnetic is | a magnetic field will cause the atoms to align for a moment, but will redomize again when the magnetic is removed |
| particle motion ___ with temperature | increases |
| the temperature at which a material will abruptly lose its ferromagnetic properties is the __ ____ | curie temperature |
| conventional current flows in the ___ direction from electrons | opposite |
| the Right Hand rule of Magnetism | if you grasp a wire so your right thumb points in thhe direction of the flow of the conventional current, the magnetic lines of force caused by the current will point in the direction your fingers wrap around the wire |
| a coil of wire that acts like a magnet | solenoid |
| a solenoid with a bar magnet in the middle makes an | electromagnet |
| electric current produces a __ __ | magnetic field |
| conversely, a magnetic field can produce an __ ___ | electrical current |
| if a bar magnet is thrust by hand theough a coil of wire, a ___is momentarily produced in th wire but only while the ___ is ___ | current; magnet; moving |
| when the ___ stops the ___ stops | magnet; current |
| sliding the __ ___ along the magnet has the same effect as ___ the magnet | wire coils; moving |
| A magnetic field affects the ____ of ___ ___ in a conductor | motion; electrical charges |
| When the ____ of magnetic field lines ____ a _____ increases or decreases, a force is exerted on the _______ in the conductor. | concentration; near; conductor; electrons |
| The _____ ______ ______ move through the conductor, creating a _____ IF the conductor is part of an ______ circuit. | highly mobile electrons; current; electrical |
| The _______ the magnetic field strength changes, the more the _____ _______. | faster; electrons move |
| The effect is called _____________ __________. | electromagnetic induction |
| If the magnetic field is UNCHANGING, then ___________ _______ is produced. | no currrent |
| Electrical generators convert __________ mechanical energy into _________ energy. | rotational; electrical |
| In a generator, some type or _____ _____, such as a steam turbine or engine, rotates a shaft attached to one or more pairs of _______ __________. | prime mover; strong magnets |
| ________ is produced by the generators. | Alternating current (AC) |
| A __________ is a machine that converts the engergy of a moving _________ into rotational motion (like a water mill). | turbine; fluids |
| Generators convert ________ __________ to ______ _________ using rotating magnets. | mechanical energy; electrical energy |
| ______ are machines that convert electrical energy into __________ ________ ________. | Motors; rotary mechanical energy |
Created by:
Jollyrancher
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