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8th Magnets &
8th Study Guide Magnets, Magnetism and Electricity
| Question | Answer |
|---|---|
| A maglev train can hover above the track without touching it because of ______. | Magnetic Force |
| Oersted was the scientist who discovered how _____. | electricity and magnetism are related |
| This is a correct statement of Faraday's Law. | A changing magnetic field produces an electric current. |
| Moving a magnet back and forth inside a coil of wire produces a (n) __________. | Alternating current |
| Factors that affect the strength of a solenoid's magnetic field include the _______. | amount of current flowing through the wire and number of turns in the wire |
| Why do the poles of the electromagnet in a electric motor keep reversing? | The current keeps changing direction |
| To use the right hand rule, you should point your thumb in the same direction as the ______. | electric current |
| Electrons spinning around the nucleus of an atom causes the atom to ________________________________________________. | be a tiny magnet, have a north and south poles and have a magnetic field. |
| What causes the Earth's magnetism? | The movement of charged particles in Earth's outer core. |
| If you increase the amount of current flowing through a wire, the magnetic field around the wire will ______. | increase in strength. |
| Ferromagnetic materials include _______. | iron, nickle and cobalt. |
| This device does NOT contain a electromagnet. | Solenoid |
| This statement would be false about magnetosphere. | It is found only over Earth's magnetic poles |
| Evidence for magnetic field reversals come from_____. | rocks on the ocean floor. |
| How is magnetic force like electric force? | It is caused by moving electrons, it generates a force field and it acts over a distance. |
| T or F Earth's magnetic and geographic poles are located in the same places. | False |
| T or F A maglev train levitates above the track because of magnetic repulsion. | True |
| T or F Moving electric charges generate a magnetic field. | True |
| T or F Earth's magnetic force is exerted over a distance. | True |
| T or F An atom is a tiny magnet because its electrons spin around its nucleus. | True |
| T or F A coiled wire has a weaker magnetic field than a straight wire. | False |
| T or F Copper and aluminum are attracted by magnets | False |
| T or F Both electric generators and electric transformers are needed to safely provide electricity to homes. | True |
| T or F The most magnetic material in nature is Magnetite | True |
| T or F Most electric devices with moving parts contain electric motors. | True |
| T or F Electromagnetic induction always requires movement of a magnet. | False |
| T or F The idea that Earth is a magnet was first proposed by William Gilbert. | True |
| T or F Reversals of Earth's magnetic field have occurred only a few times in the past. | False |
| T or F The magnetic field created by current flowing through a wire surrounds the wire in concentric circles. | True |
| The north or south end of a magnet is known as a magnetic ______ | pole |
| The north poles of two magnets ______ each other | repel |
| Kinetic energy in a power plant is supplied by a (n) turning ____. | turbine |
| A (n) _________ is a coil of wire with electric current flowing through it, giving it a magnetic field. | solenoid |
| Magnetism produced by an electric current is called ____. | electromagnetism |
| An area of a ferromagnetic material where the poles of all the atoms are aligned is a (n) _______. | magnetic domain |
| A device that uses an electromagnet to change electrical energy to kinetic energy is a (n) ____________. | electric motor |
| Earth's magnetic field is called the _____. | magnetosphere |
| A device that uses electromagnetic induction to change kinetic energy to electrical energy is a (n) _____________________. | electric generator |
| A device that uses electromagnetic induction to increase the voltage of electric current is a (n) _______. | electric transformer |
| The area around a magnet where it exerts magnetic force is its _____. | magnetic field |
| A (n) ____________ is a continuous flow of electric charges. | electric current |
| A (n) _________ is a material through which electric current can flow. | electric conductor |
| A (n) __________ occurs when Earth's magnetic poles switch places. | magnetic reversal |
| Earth's north magnetic pole is located at about ______ north latitude. | 80 degrees |
| Describe how magnetic fields interact. | Opposite fields attract and join to each other. Same charge fields repel and push against each other. |
| Describe the magnetosphere. | Huge region that extends outward from Earth for several thousand kilometers. The strongest force is located at the poles. |
| Identify two factors that affect the magnetic field surrounding a wire that is carrying electric current. | Direction and Strength of current. |
| Compare and Contrast a solenoid and bar magnet. | Both a solenoid and a bar magnet have north and south poles. A solenoid is a coil of wire with electric current flowing through it, giving it a magnetic field. A bar magnet has no electricity. |
Created by:
cromine