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Physics 2 Unit I

Electrostatics part 1

what is electrostatics? the science that deals with stationary or resting electric charges
what is electrification? an imbalance of charges due to when an object becomes electricity charged by it gaining or loosing e-
what is the difference between ionization and electrification? ionization deals with an ion level of an individual atom; electrification deals with the entire object
what are the 3 methods of electrification? friction, contact, induction
what is the process of contact? when one object is neutral is the other has a charge. Excess e- or protons will go to the neutral object so that both objects become balanced with whatever charge the object with excess had.
How does combing your hair and then touching a piece of paper cause static electricity? The comb receives excess e- that were transferred to the comb from the hair. Once the comb touchesc the paper, the e- on the paper are repelled from the - charged comb and then the paper becomes more + charged. Then a "shock" occurs when the two attract.
name the one object that is always available to accept electric charges from an electrified object. Earth
Out of the 3 methods of electrification, which one is involved when lightning is formed? induction; when the cloud and wind movement removes e- from one cloud and deposits them on another (clouds have opposite charges)qgR
what is the smallest unit of electrical charge? an electron
what does it mean when an object is said to be electrified? if it has too many or too few electrons
what is the difference between contact and induction in the methods of electrostatics? contact: begins with a neutral & one charged object the result=both objects are electrified with same charge induction: one charged object and results in both objects electrified with opposite charges. induction uses the electrical field also.
True or False: Induction includes contact with the two objects involved. False.
True or False: electrostatic force between 2 charged objects is inversely proportional to the product of their magnitudes & directly proportional to the square of the distance between them. False. force increases; magnitude increases DIRECT. if 2 like charges decrease the distance between them (closer together) then their pull (repel) is stronger (increase)
Why is it that if you have like charges closer together their pull (repelling) will be stronger to bring them together? Because when you bring like charges closer together; they are repelling due to the overlap of their electrical fields=greater force trying to push them together.
True or False: static charges only reside on the external surface of an object. True
On a curved surface where is the concentration of charges the greatest? on the greatest curve of the object
Which charges are only able to move thru a solid conductor? negative charges
what is electrodynamics? the science of electrical charges in motion
what causes an e- to move? a surplus of e- in one place and a deficit in another. when the surplus e- come near the object with the deficit the e- in the deficit move away creating that object to now have a + charge.
what are the four materials used in electrical circuits? 1. conductors 2. insulators 3. semi-conductors 4. superconductors
what are examples of good conductors? copper, silver, water
what is an insulator? materials that inhibit the e- to flow; used to confine the flow of e-. opposite of conductors
what is a conductor? any substance through which electrons flow easily
what is the difference between a superconductor and a semi-conductor? superconductors allow e- to flow through a circuit w/o resistance. Conductors have resistance.
what is a semi-conductor? special materials which can be either insulators or conductors by nature. In certain circumstances they can perform the opposite function.
what are examples of good insulators? glass, clay, earthlike materials
what are examples of semi-conductors? silicon, germanium
what are examples of superconductors? niobium, titanium, magnets in MRI; for material to behave as a superconductor it must be made very cold (requires more E)
what is it called when the conductor is enclosed in a spare pathway and the flow is controlled? electric circuit
Describe the nature of an electric current when e- flow thru the conductor. the outershell e- are loosely bounded, they can be made to move under certain circumstance. individual e- move fairly slow; an electrical current moves very fast (almost light speed).
Created by: mokapis