* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Magnetism and Electromagnetism Review Answers
Induction heater wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Electricity wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Neutron magnetic moment wikipedia , lookup
Electromotive force wikipedia , lookup
Alternating current wikipedia , lookup
History of electrochemistry wikipedia , lookup
Magnetic nanoparticles wikipedia , lookup
Magnetic monopole wikipedia , lookup
Electromagnetism wikipedia , lookup
Magnetic field wikipedia , lookup
Lorentz force wikipedia , lookup
Hall effect wikipedia , lookup
Electric machine wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Scanning SQUID microscope wikipedia , lookup
Multiferroics wikipedia , lookup
Superconductivity wikipedia , lookup
Magnetic core wikipedia , lookup
Faraday paradox wikipedia , lookup
Galvanometer wikipedia , lookup
Magnetoreception wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Eddy current wikipedia , lookup
Magnetochemistry wikipedia , lookup
Superconducting magnet wikipedia , lookup
Electromagnet wikipedia , lookup
Test Review Magnetism & Electromagnetism 1. What are the 3 metals that are ferromagnetic? iron, nickel, and cobalt 2. The reason a magnet can attract an unmagnetized nail is that nails become ( temporarily / permanently ) magnetized in a magnetic field. temporarily 3. How does an iron rod become magnetic? When the net spin of its electrons point in the same direction. 4. Where is the magnetic field strength the strongest in a magnet? at the poles 5. Earth’s geographic North Pole of the earth is close to its magnetic _______ pole. South 6. Which pole of a compass needle points to the south pole of a magnet? North 7. What are magnetic domains? Regions of atoms magnetically aligned. 8. If you break a bar magnet in half, what happens to the 2 halves? You get 2 bar magnets with 2 poles 9. How are magnetic field lines surrounding a magnet conventionally drawn? From south to north OR From north to south From north to south 10. The picture below shows the magnetic field of 2 magnets, a ___ pole on the right and a ____ pole on the left. North; North 11. The picture below shows the magnetic field of 2 magnets, a ____ pole on the right and a ____ pole on the left. North; South 12. If the opposite poles of magnets are brought near each other, what will happen? They will attract 13. If 2 like poles of a magnet are brought near each other, what will happen? They will repel 14. If you put a compass in a magnetic field, the compass will line up ( randomly / parallel / perpendicular ) to the magnetic field lines. parallel 15 a. Where is the magnetic field the strongest? At Point A 15 b. Where is the direction of the current in the wire directed? down 16. If you bent the wire into a loop, like the picture to the right, where is the magnetic field the strongest? at the center 17. What do you need to make an electromagnet? battery, wire, and a nail 18. What is electromagnetic induction? Inducing voltage by changing the magnet field around a conductor. 19. The magnetic field strength of an electromagnet will be greater if the wire’s ( resistance / temperature / current ) is increased. current 20. The magnetic field strength of an electromagnet will be decreased if the number of coils of a solenoid is ( increased / decreased / stays the same ). decreased 21. The magnetic field strength of an electromagnet will be greater if the curled wire encloses ( a wooden block / an iron rod ). an iron rod 22. Using the 1st right hand rule, where does your thumb point? in the direction of the conventional current. 23. Electricity is transmitted from the power plant to your home using ( AC / DC ) circuits. AC 24. Label where the north pole would be in the electromagnet illustrations? N N 25. Magnetic fields could be produced by particles that are ___. a. Moving and neutral c. Stationary and charged b. moving and charged d. stationary and neutral b. moving and charged 26. When a loop of wire is rotated, like in the magnetic field shown, what is produced in the wire? a current 27. A transformer works due to the mutual induction created by a changing _________ __________. magnetic field 28. A generator converts ( potential / kinetic ) energy into ( electrical / mechanical ) energy. kinetic; electrical 29. What is the energy source of a generator? turbine; also has a magnet & a coil of wire 30. A device that transforms electrical energy to kinetic energy is a ( generator / transformer / motor). motor 31. A device that uses 2 coils around an iron core to change the voltage across a circuit is called a ( generator / transformer / motor ). transformer 32. Transformers ( increase / decrease ) the current in the transmission lines to reduce the risk of electric shock in your home. decrease 33. In the transmission of electricity, electricity is transmitted at a ______ voltage and ______ current. high; low 34. A step-down transformer ( increases / decreases) voltage. decreases 35. In a fossil fuel power plant, ( water / wind / steam) turns the turbine. steam