Gauss Law and potential Which one to use

In summary, when dealing with a symmetric charge distribution where Gauss Law can be applied, it is more advantageous to use Gauss Law to obtain the electric field rather than the potential. This is because it is easier to calculate the electric field using Gauss Law. However, the method chosen may vary depending on the specific situation and desired outcome. For general electrostatics, solving Poisson's equation can be a joyful process, as the Laplacian is separable in multiple coordinate systems. Utilizing an orthogonal function expansion can also be a useful approach depending on the symmetry of the problem.
  • #1
Elumalai
2
0
Given a symmetric Charge distribution where Gauss Law can be applied which method will one select to obtain Electric field. Potential or Gauss Law. I feel that Gauss law must be used because using Gauss law one can calculate electric field easily as compared to Potential. Which is advantageous, Gauss Law or potential.

Thanks in Advance.
 
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  • #2
Honestly I say it varies considerably. If you are looking far away your treatment will be different, then if you want a general solution. But for general electrostatics, solving possion's equation is a joy, and the laplacian is separable in something like 13 different coordinate systems. Using an orthogonal function expansion is a nice way depending on the symmetry then.
 

Related to Gauss Law and potential Which one to use

1. What is Gauss Law and how does it relate to potential?

Gauss Law is a fundamental law in electromagnetism that describes the relationship between electric fields and electric charges. It states that the electric flux through any closed surface is equal to the total charge enclosed by that surface divided by the permittivity of free space. This law is closely related to the concept of potential, which is a measure of the work required to move a unit positive charge from one point to another in an electric field.

2. When should Gauss Law be used and when should potential be used?

Gauss Law is typically used to calculate electric fields in situations where there is a high degree of symmetry, such as with spherical or cylindrical charge distributions. On the other hand, potential is often used in cases where the electric field is not easily calculable, such as with non-uniform charge distributions or complex geometries.

3. Can Gauss Law and potential be used interchangeably?

No, Gauss Law and potential are two different concepts and cannot be used interchangeably. Gauss Law is a physical law that describes the behavior of electric fields, while potential is a mathematical concept that quantifies the energy associated with an electric field.

4. How does Gauss Law and potential relate to each other mathematically?

Gauss Law and potential are mathematically related through the gradient operator. The electric field is the negative gradient of the potential, meaning that the direction of the electric field is in the direction of decreasing potential. This relationship can be expressed mathematically as E = -∇V, where E is the electric field, V is the potential, and ∇ is the gradient operator.

5. What are the units of Gauss Law and potential?

In SI units, Gauss Law has units of Newtons per Coulomb (N/C) while potential has units of Volts (V). In terms of fundamental units, Gauss Law can be expressed as kg⋅m⋅s^-2⋅C^-1 and potential can be expressed as kg⋅m^2⋅s^-3⋅A^-1.

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