Electric Flux Concepts and Calculations

What is electric flux?

• The product of electric field and volume.

• The product of perpendicular electric field and area.

• The sum of electric field and area.

• The ratio of electric field to area.

If an electric field is perpendicular to a surface, what is the angle between the normal line to the surface and the electric field vector?

• 90 degrees

• 45 degrees

• 0 degrees

• 180 degrees

What is the electric flux through a surface if the electric field vector is parallel to the surface?

• Maximum

• Zero

• Negative

• Undefined

What is the electric flux through a closed spherical surface that encloses a charge Q?

• Q * ε₀

• Q / ε₀

• Q * 4πR²

• Q / (4πR²)

What is the electric flux through a circular disk with a radius of 3 meters, if it is placed in a uniform electric field of 100 N/C, and the electric field makes an angle of 30 degrees with the plane of the disk?

• 450π N·m²/C

• 900π N·m²/C

• 450 N·m²/C

• 900 N·m²/C

What is the total electric flux emanating from a closed surface that encloses a charge Q?

• 0 N·m²/C

• Q/ε₀

• E⋅A

• Q⋅ε₀

A positive charge of 30 microcoulombs is placed at the center of a cube. What is the electric flux that passes through one face of the cube?

• 3.39 × 10⁶ N·m²/C

• 0 N·m²/C

• 5.65 × 10⁵ N·m²/C

• 1.70 × 10⁶ N·m²/C

What is the net electric flux through a closed cube placed in a uniform electric field, if there is no charge enclosed within the cube?

• 0 N·m²/C

• E⋅A

• -E⋅A

• 2E⋅A