Xem mẫu
Physics 2
Lecture 2 Gauss’s Law
Gauss’s Law
Conductors in Electrostatic Equilibrium
Ngac An Bang, Faculty of Physics, HUS 1
Gauss’s Law Ngac An Bang, Faculty of Physics, HUS Gauss’s Law
In a table-top plasma ball, the colorful lines emanating from the sphere give evidence of strong electric fields. Using Gauss’s law, we show in this chapter that the electric field surrounding a charged sphere is identical to that of a point charge. (Getty Images)
2
Gauss’s Law Ngac An Bang, Faculty of Physics, HUS Gauss’s Law
Introduction
Avery useful computational technique Two of Maxwell’s Equations Gauss’s Law –The Equation
ΦE = EdA = Closed surface
qin e0
The total “flux” of field lines penetrating any of these surfaces is the same and depends only on the amount of charge inside
3
Gauss’s Law Ngac An Bang, Faculty of Physics, HUS Gauss’s Law
Introduction = An
Air flow rate (flux) throughA
Φ = v A = vA Φ = v A = vAcosq
4
Gauss’s Law Ngac An Bang, Faculty of Physics, HUS Gauss’s Law
Electric flux = An
ΦE = EA = EAcos 00 = EA ΦE = EA = EAcosq = EA`
• We showed that the strength of an electric field is proportional to the number of field lines per area.
• Electric flux ΦE is proportional to the number of electric field lines penetrating some surface.
5
...
- tailieumienphi.vn
nguon tai.lieu . vn