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Phys Chapter11 Bonus
| Question | Answer |
|---|---|
| The ancient Greeks found _ which baffled them with their strange ability to attract and hold iron pieces. | Lodestones |
| Magnetic objects always have a _ and _ magnetic pole. | North, South |
| Objects with a north and south magnetic pole are called | Magnetic dipoles |
| If you cut a magnet in half, you will end up with | 2 smaller magnets |
| 2 smaller magnets each have a | north and south magnetic pole. |
| Scientists have found that even when magnets are divided as many times as physically possible, each of the microscopic fragments have a | north and south magnetic pole. |
| Even the mecular structures that form magnets exhibit a | magnetic dipole. |
| Magnetism is a | field force |
| A magnetic field can be modeled using | magnetic lines of force, which are similar to an electric field's lines of force. |
| Magnetic lines of force are modeled as _ loops both within a magnetized object as well as in the space around it. | continous |
| 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 northe magnetic poles and toward _ magnetic poles. | away; south. |
| The distance between field lines indicates the | strength of the field at that point. |
| Law of MAGNETISM | Opposite poles attract, like poles repel. |
| Magnets strongly attract | ferromagnetic materials. |
| Some materials are only slightly attracted to magnets these are | paramagnetic materials. |
| Large groups of magnetic dipoles automatically align in the same direction to form microscopic regions called | domains |
| magnetism starts at the | particle lebel |
| In unmagnetized ferromagnetic materials the magnetic directions of the domains are oriented randomly, so their magnetic forces | cancel eachother. |
| When the external magnetic field is applied the domains align to form a | permanent magnet. |
| The atoms of a paramagnetic materials don't reside in domains and are | randomly oriented. |
| Magnetic field will cause the atoms to align for a moment but will randomize again | once the magnet is removed. |
| Particle motion | increases with temperature |
| The temperature at which material will loose its ferromagnetic properties is th | curie temperature. |
| 770 C | Curie Tempe |
| Curie Temp @ F | 1418 |
| Conventional electrical current flows in the | opposite direction from electrons. |
| Right hand rule of Magnetism | If you grasp a wire so your right thumb points in the direction of the flow of the convectional current, the magnetic lines of force caused by the current will point in the direction your fingers wrap around the wire. |
| Solenoid | A coil of wire that acts like a magnet. |
| A solenoid with a bar magnet inserted in the middle makes an | electromagnet. |
| Electric current produces a | magnetic field |
| a magnetic field produces a | electric current |
| If a bar magnet is thrust by hand through a coil of wire, a current is momentariliy produced in the whire but | only while the magnet is moving |
| When the magnet stops moving | the current stops |
| sliding the wire coil along the magnet has the same effect as | moving a magnet. |
| Increasing the number of coils or the speed of motion | increases the amount of current produced. |
| A magnetic field affects the motion of | electrical charges in a conductor. |
| When concentration of magnetic field lines near a conductor increases or decreases, a force is exerted on the | electrons |
| The highly mobile electrons move through the conductor creating a | current if the conductor is a part of an electrical circut |
| The faster the magnetic field strength changes, | the more the electrons move. This effect is called: electromagnetic induction. |
| If the magnetic field is unchanging then | no current is produced |
| Electrical generators convert _ mechanical energy into _ energy. | rotational; electrical. |
| In a generator, some type of prime mover, such as a steam turbine or engine, rotates a shaft attatched to one or more paits of | strong magnets. |
| Alternating current is produced by | generators. |
| A turbine is a machine that converts the energy of a moving fluid into | rotational motion. |
| Generators convert mechanical energy to electrical energy using | rotating magnets. |
| Motots are machines that convert electrical energy into | rotating mechanical motion. |
| Showed that the earth is a giant magnet. | William Gilbert |
| Geographic North pole is at the: (All the geographical lines of longitude meet here) | top of the earth's spin. |
| Magnetic North pole is | where the earth's concentrated magnet field lines are vertical at the earth's surface. |
| Compass' are attracted to the | magnetic north pole; NOT the geographic north pole! |
| The earth's north magnetic pole is actually | a south magnetic pole. |
| The earth's magnetic field originates | deep inside the earth, probably de to the flow of liquid iron. |
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