Kuliah Fisdas 2 Bab 3 Muatan Listrik Kontinu

7/29/2019 Kuliah Fisdas 2 Bab 3 Muatan Listrik Kontinu

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Geological Engineering Department

Faculty of Engineering

Physics for Scientists and Engineers

Electric Charge

and Electric Field 2


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Review


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Coulomb Law


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Review


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Electric Field Lines

An electric field line is an imaginary line orcurve drawn through a region of space so that

its tangent at any point is in the direction of the

electric-field vector at that point


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Electric Dipoles

An electric dipole is a pair of point chargeswith equal magnitude and opposite sign (a

positive charge and a negative charge)

separated by a distance.


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Gausss law is part of the key to using symmetryconsiderations to simplify electric-field

calculations.

Gausss law is more than just a way to make

certain calculations easier. Indeed, it is a

fundamental statement about the relationship

between electric charges and electric fields.


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Charge & Electric Fluxs

Gausss law states that the total electric fluxthrough any closed surface (a surface enclosing

a definite volume) is proportional to the total

(net) electric charge inside the surface.


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Lets imagine that we put a ring with areaAperpendicular to a stream of water flowing withvelocity v

The product of area times velocity,Av, gives thevolume of water passing through the ring per unittime The units are m3/s

If we tilt the ring at an angle , then the projectedarea isA cos, and the volume of water per unittime flowing through the ring isAvcos .

Av


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We call the amount of water flowing through the ring the

f luxof water

We can make an analogy with electric field lines from a

constant electric field and flowing water

We call the density of electric field lines through an areaA the electric flux given by

cosFlux Av

E

A

cosFluxElecric EA


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Application of Gauss Laws


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Class Assignment


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G l i l E i i D


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G l i l E i i D t t


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G l i l E i i D t t


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G l i l E i i D t t


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Lightning Strikes a Car

The crash-test dummyis safe, but the right

front tire didnt make it

High Voltage Laboratory,Technical University Berlin, Germany



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Kuliah Fisdas 2 Bab 3 Muatan Listrik Kontinu

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