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Electric Flux and Uniform Electric Field

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Electric Flux and Uniform Electric Field

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Questions and Answers

What is the purpose of dividing a general surface into small elements of area ΔA?

To calculate the electric field at each element

To neglect the variation in the electric field over one element (correct)

To define the direction of the vector ΔAi

To find the net electric flux through the surface

What is the direction of the vector ΔAi with respect to the surface element?

Parallel to the surface element

Tangent to the surface element

At an angle θi to the surface element

Perpendicular to the surface element (correct)

What is the flux through the element ΔAi in terms of the electric field Ei and the angle θi?

EiΔAi / cosθi

EiΔAi sinθi

EiΔAi / sinθi

EiΔAi cosθi (correct)

What is the net flux through a closed surface surrounding a point charge q?

q/ε0 Signup and view all the answers

Why does the charge q4 not contribute to the flux through any surface in Figure 5?

Because it is outside all surfaces Signup and view all the answers

What is the direction of the electric field E at every point on the spherical gaussian surface in Figure 6?

Perpendicular to the surface Signup and view all the answers

What is the electric flux ∅𝐸 through a rectangular surface of area A, when the surface is perpendicular to the electric field?

EA Signup and view all the answers

What is the unit of electric flux?

Newton-meters squared per coulomb (N.m2/C) Signup and view all the answers

What happens to the electric flux when the surface under consideration is not perpendicular to the electric field?

It decreases Signup and view all the answers

What is the relationship between the number of electric field lines and the magnitude of the electric field?

The number of lines is directly proportional to the magnitude of the electric field Signup and view all the answers

Why is the flux through A’ equal to the flux through A in Figure 2?

Because the number of field lines passing through A’ are the same as the number of field lines passing through A Signup and view all the answers

What is the generalized formula for electric flux when the surface is at an angle θ to the electric field?

∅𝐸 = EAcoshθ Signup and view all the answers