Gauss's Law Calculator

Enter your Electric Charge (Q) and select your Charge Unit, and this Gauss's Law Calculator uses the Permittivity of Free Space (ε₀) to calculate the resulting Electric Flux (Φ) — displayed in both standard and scientific notation, along with your charge converted to Coulombs.

C

Electric charge enclosed by the surface

C²/N·m²

Permittivity constant (8.854 × 10⁻¹² C²/N·m²)

Results

Electric Flux (Φ)

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Electric Flux (Scientific Notation)

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Charge in Coulombs

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Frequently Asked Questions

What is Gauss's law?

Gauss's law states that the electric flux through any closed surface is proportional to the electric charge enclosed within that surface. Mathematically, it's expressed as Φ = Q/ε₀, where Φ is electric flux, Q is enclosed charge, and ε₀ is the permittivity of free space.

How do you calculate electric flux using Gauss's law?

To calculate electric flux using Gauss's law, divide the enclosed electric charge (Q) by the permittivity of free space (ε₀ = 8.854 × 10⁻¹² C²/N·m²). The formula is Φ = Q/ε₀, which gives the total flux through the closed surface.

What is electric flux?

Electric flux is a measure of the electric field passing through a given surface. It represents how much electric field 'flows' through the surface and is measured in N·m²/C. The flux depends on the field strength, surface area, and the angle between field lines and the surface.

Does electric flux depend on the surface shape?

No, according to Gauss's law, the electric flux through any closed surface depends only on the total charge enclosed within that surface, not on the shape or size of the surface. Different shaped surfaces enclosing the same charge will have the same total flux.

Is electric flux a scalar or vector quantity?

Electric flux is a scalar quantity, even though it's calculated from the electric field (a vector) and surface area (a vector). The dot product of these vectors results in a scalar value that can be positive or negative depending on the direction of field lines.

What are the units of electric flux?

Electric flux is measured in N·m²/C (Newton-meters squared per Coulomb) or equivalently V·m (Volt-meters). These units represent the amount of electric field passing through a surface area.

When is Gauss's law most useful?

Gauss's law is most useful when dealing with highly symmetric charge distributions such as spheres, infinite lines, or infinite planes. In these cases, it provides a much simpler method to calculate electric fields compared to Coulomb's law.

What is the permittivity of free space?

The permittivity of free space (ε₀) is a fundamental physical constant equal to 8.854 × 10⁻¹² C²/N·m². It represents the ability of free space (vacuum) to support an electric field and appears in many electromagnetic equations including Gauss's law.

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