4 electrostatic intro
- 1. Electrostatics Electrons Sitting Still Charge inherent property of matter, one of the 7 fundamental units only two types of charge, positive & negative charge of proton & electron are exactly equal, but oppositely charged Constants 1 e = -1.6 x 10-19 C Proton is the same but + Mass of a Proton = mp = 1.67 x 10-27 kg Mass of an electron = me = 9.11 x 10-31 kg notice mp = 2000 * me
- 2. Rules for looking at Charges Law of Conservation of Charge the net electric charge of a system must remain constant Like charges repel and unlike charges attract.
- 3. 3 ways to charge 1. Friction charge is transferred due to the friction of materials in contact. (Since friction depends on the type of materials, so does this) 2. Contact When 2 objects touch, e’s flow from one to the other 3. Induction Charging an object without actually touching it.
- 4. + - - + + + - - - - - - - - - - + + + -
- 5. Ground - + - - + - - - - - - - - + + - - - - - - - + + - +
- 6. Ground + + + + + - - - - - - + +
- 7. Polarization Special form of induction One side of an object is induced to be slightly more positive (or negative) than the other side. + + + + + + + + + +++ -- - - - - -- -- - - + ++ + + + + + + + +
- 8. 4 ways to travel 1. Insulator e’s don’t flow easily 2. Semiconductor sometimes conducts, sometimes insulates 3. Conductors e’s flow easily 4. Super conductors substance that has no resistance when its temp gets close to absolute zero.
Editor's Notes
- #3: Notice that it doesn’t say charge cannot be created or destroyed.