charges and electric field - uni siegen · 2018. 12. 13. · (gauss' law with dielectric)....
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Charges and electric field
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Coulomb´s law
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charges
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Electric field
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Electric field of a dipole
Dipole moment
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Elementary charge
Probe the field by a „test“ charge q
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Gauss law
flux
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Electrical flux
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Gauss law and Coulomb law
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E-Field of a conducting plate
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Electrical potential
Applied work Wappl = q DV
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Equipotential surfaces
Defined by DV=0,No work is done on a equipotential plane
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Calculating potential in an electric field
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Potential due to a point charge
A system of point charges
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Calculating E from V
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Capacity calculation
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Parallel and Series connection of capacities
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Energy stored in electric field
Dielectric constants
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Dielectrics
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Current and current density
i = dq/dt
1 Ampere = 1 A = 1 coulomb per second
i= i1 + i2
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Resistance and resistivity
R = V/I Ohm´s law
1 Ohm = 1 W = 1 volt per ampere
r = E/J [Wm]
s = 1/r [1/Wm]
R= r L/A
J= s E
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Power in Electric Circuits
Using Ohm´s law
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Electrical circuits
EMF = electromotive force
Single loop circuit
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Potential loop of a circuits
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Multiloop circuits
i1 + i3 = i2
Substitute : i3R3
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example
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RC - circuits
t= RC