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Home/ Questions/Gauss’s law relates the electric flux ΦE through a closed surface to the total charge qencl enclosed by the surface:
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ptntuto
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ptntuto
Asked: April 11, 20222022-04-11T18:35:44+00:00 2022-04-11T18:35:44+00:00In: Physics

Gauss’s law relates the electric flux ΦE through a closed surface to the total charge qencl enclosed by the surface:

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Gauss’s Law in 3, 2, and 1 Dimension 

Gauss’s law relates the electric flux ΦE through a closed surface to the total charge qencl enclosed by the surface:

Part A:

Determine the magnitude E(r) by applying Gauss’s law. Express E(r) in terms of some or all of the variables/constants q, r, and ϵ0.

Part B:

By symmetry, the electric field must point radially outward from the wire at each point; that is, the field lines lie in planes perpendicular to the wire. In solving for the magnitude of the radial electric field E(r) produced by a line charge with charge density λ, one should use a cylindrical Gaussian surface whose axis is the line charge. The length of the cylindrical surface L should cancel out of the expression for E(r). Apply Gauss’s law to this situation to find an expression for E(r). (Figure 2) Express E(r) in terms of some or all of the variables λ, r, and any needed constants.

Part C:

In solving for the magnitude of the electric field E(z) produced by a sheet charge with charge density σ, use the planar symmetry since the charge distribution doesn’t change if you slide it in any direction of xy plane parallel to the sheet. Therefore at each point, the electric field is perpendicular to the sheet and must have the same magnitude at any given distance on either side of the sheet. To take advantage of these symmetry properties, use a Gaussian surface in the shape of a cylinder with its axis perpendicular to the sheet of charge, with ends of area A which will cancel out of the expression for E(z) in the end. The result of applying Gauss’s law to this situation then gives an expression for E(z) for both z>0 and z<0. (Figure 3) Express E(z) for z>0 in terms of some or all of the variables/constants σ, z, and ϵ0.

Revelant knowledge 

Gauss’s Law is a rule of law that links to the spread of the electric charges to the generated electrical field. In its complete form it declares that flow that is generated by that electrical field from an undefined enclosed area will be proportional in proportion to the electric charge that is contained by the surface, regardless of the way in which that charge is divided.

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    Linda Johnson
    2022-04-12T00:14:56+00:00Added an answer on April 12, 2022 at 12:14 am

    My answer: 

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