Electric Flux and Gauss's Law Review

A set of vocabulary flashcards defining key concepts, formulas, and units related to electric flux and surface types as covered in the Physics Messiah lecture.

Electric Flux ($\phi$)

The number of electric field lines passing through an area or surface.

Open Surface

A flat surface such as a rectangle, circle, square, or triangle.

Closed Surface

A surface such as a cube, cuboid, sphere, cylinder, or pyramid.

Electric Flux Formula (Angle-Independent)

$\phi = EA$, used when no angle is provided in the question.

Electric Flux Formula (Angle-Dependent)

$\phi = EA \cos(\theta)$, used when an angle is provided in the question.

E

The magnitude of the Electric field, measured in $N/C$ or $NC^{-1}$.

A

The area of the surface.

$$\theta$$

The angle between the electric field and the area vector.

Angle Calculation for Surface-Field Interaction

To obtain the angle between the electric field and the area vector when given the angle with the surface, use the formula $(90 - \theta)$, where $\theta$ is the angle given in the question.

Unit of Electric Flux

The units for electric flux result in $Nm^2/C$.

Area of a Rectangle

$L \times B$ (Length multiplied by Breadth).