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19 Cards in this Set
- Front
- Back
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Charge |
Pos or Neg, Like Signs Repel, Oposite Repel |
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Quantinization |
Charge is quantized, occurs in integer multiples of the fundamental charge unit e |
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electron charge |
-e |
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proton chrge |
+e |
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e = |
1.6 x 10^-19 Coulumbs |
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Conductor |
Metals, about one electron per atom is delocalized - able to move freely in material |
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Insulator |
All electrons are bound to nearby atoms |
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Ground |
Large conductor (Earth) that can absorb virtually unlimited amount of charge |
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Charging by induction |
to charge conductor by induction: -connect a ground to conductor -hold external charge near conductor to attract or repel electrons -disconnect conductor from ground -move external charge away from conductor |
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Coulombs Law |
Force exerted by point charge q1 on point charge q2 a distance r away is given by F=((k*q1*q2)/(r^2)) * r12 in direction r12 - direction of vector between q1 and q2 |
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Electric Field |
Field due to a system of charges at a point is defined by F exerted by those on a very small positive test charge q0 E = F/q0 |
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Electric field due to point charge |
F=((k*q1)/(r^2)) * r1 |
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Electric field multiple point charges |
Vector sum of all point charges |
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Electric Field Lines |
Field can be represented by charge lines emanating from pos and terminating on neg charges. S |
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Dipole |
System of two equal but opposite charges separated by a small distance |
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Dipole Movement |
p=qL L is position of pos charge related to neg charge |
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Field due to dipole |
Electric field strength far from a dipole is proportional to the magnitude of the movement of the dipole and decreases with the cube of the distance |
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Polar Molecules |
Permanent dipole, Their centers of pos and neg charge dont coincide. Behave like simple dipoles |
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Non Polar Molecules |
Dont have permanent dipoles, they acquire induced dipole moments in the presence of an electric field |
