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Electric field is the electrostatic forc...

Electric field is the electrostatic force per unit charge acting on a vanishingly small test charge placed at that point. It is a vector quantity and the electric field inside a charged conductor is zero. Electric flux `phi` is the total number of electric lines of force passing through a surface in a direction normal to the surface when the surface is placed inside the electric field.
`phi=ointvecE.vec(ds)=q/epsilon_0`
We have a Gaussian surface of radius R with Q at the centre, then

A

The total electric flux of the sphere is `phi=-Q/epsilon_0`

B

On the surface of the sphere, we have `E=-Q/(4piepsilon_0R^2)`

C

Flux ,through the surface of sphere due to 5Q is zero.

D

Field on the surface of sphere due to -2Q is the same everywhere.

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