Under what conditions can the electric flux - E be found through a closed surface-

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Standard XII

Physics

Charges on Large and Parallel Conducting Plates

Under what co...

Question

Under what conditions can the electric flux $ϕ_{E}$ be found through a closed surface?

If the magnitude of the electric field is known everywhere on the surface

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If the total charge inside the surface is specified

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If the total charge outside the surface is specified

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Only if the location of each point charge inside the surface is specified

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Solution

The correct option is B If the total charge inside the surface is specified
We should know the total charge inside. There is no contribution in the flux due to outside charges.
Also, we should know both magnitude and direction of electric field at any point on the surface.

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Similar questions

Q. If the flux of the electric field through a closed surface is zero,
(a) the electric field must be zero everywhere on the surface
(b) the electric field may be zero everywhere on the surface
(c) the charge inside the surface must be zero
(d) the charge in the vicinity of the surface must be zero

Q. Conceptual Questions :
If the total charge inside a closed surface is known but the distribution of the charge is unspecified, can you use Gauss’s law to find the electric field? Explain.

If magnitude of the electric Flux entering the closed surface is 5 Nm2 /C and leaving the surface is 3Nm2 /C then the magnitude of net electric charge inside the surface is?

Q. If the electric flux entering and leaving a closed surface are respectively of magnitude

ϕ_{1}

and

ϕ_{2}

then the electric charge inside the surface will be

Comment on the correctness of the following two statements

Statement I => The electrical field calculated by Gauss’s law is the field only due to the charges inside the Gaussian surface.

Statement II => The flux of the electric field through a closed surface due to all the charges (inside and outside the surface), is equal to the flux only due to the charges enclosed by the surface.

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Under what conditions can the electric flux ϕE be found through a closed surface?

The correct option is B If the total charge inside the surface is specifiedWe should know the total charge inside. There is no contribution in the flux due to outside charges.Also, we should know both magnitude and direction of electric field at any point on the surface.

Under what conditions can the electric flux $ϕ_{E}$ be found through a closed surface?

The correct option is B If the total charge inside the surface is specified
We should know the total charge inside. There is no contribution in the flux due to outside charges.
Also, we should know both magnitude and direction of electric field at any point on the surface.