Electric Flux Flashcards
(56 cards)
What is electric flux?
Electric flux is a measure of the quantity of electric field lines passing through a given surface.
What is the formula for calculating electric flux?
Electric flux (Φ) is calculated using the formula Φ = E · A · cos(θ), where E is the electric field strength, A is the area, and θ is the angle between the field lines and the normal to the surface.
True or False: Electric flux can be negative.
True.
Fill in the blank: The unit of electric flux in the International System of Units (SI) is _____.
Newton meter squared per coulomb (N·m²/C).
What does the symbol ‘Φ’ represent in the context of electric flux?
The symbol ‘Φ’ represents electric flux.
How does electric flux change with the angle θ?
Electric flux decreases as the angle θ increases from 0° to 90°.
What is the electric flux through a closed surface?
The electric flux through a closed surface is proportional to the charge enclosed within that surface, according to Gauss’s law.
What does Gauss’s law state regarding electric flux?
Gauss’s law states that the total electric flux through a closed surface is equal to the charge enclosed divided by the permittivity of free space.
True or False: Electric flux is independent of the shape of the surface.
True, as long as the surface encloses the same charge.
Which constant is used in the calculation of electric flux in a vacuum?
The permittivity of free space (ε₀).
What is the relationship between electric field strength and electric flux?
Electric flux increases with an increase in electric field strength.
If the electric field is uniform, how can electric flux be simplified?
If the electric field is uniform, electric flux can be simplified to Φ = E · A.
Fill in the blank: Electric flux is directly proportional to the _____.
Area of the surface.
What happens to the electric flux if the area is doubled, keeping the electric field strength constant?
The electric flux will also double.
What type of surface yields the maximum electric flux when placed in a uniform electric field?
A surface perpendicular to the electric field lines.
True or False: Electric flux can be zero.
True, if the electric field is parallel to the surface.
What is the electric flux through a spherical surface surrounding a point charge?
The electric flux is equal to the charge enclosed divided by ε₀.
Fill in the blank: The electric flux density is also known as _____.
Electric displacement field (D).
True or False: Electric flux is a scalar quantity.
True.
What does it mean if electric flux is positive?
It means that the electric field lines are exiting the surface.
What does it mean if electric flux is negative?
It means that the electric field lines are entering the surface.
What is the effect of a dielectric material on electric flux?
A dielectric material reduces the electric field strength, thus reducing the electric flux.
Fill in the blank: Electric flux is influenced by the ____ of the electric field.
Magnitude and direction.
What is the relationship between electric flux and charge density?
Electric flux is related to charge density through Gauss’s law.
