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A charge Q is placed at a distance of 4R above the centre of a disc of radius R. The magnitude of flux through the disc is ϕ. Now a hemispherical shell of radius R is placed over the disc such that it forms a closed surface. The flux through the curved surface (taking the direction of area vector along outward normal as positive), is -

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Important Questions on Electrostatics

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A charge q is placed at the corners of a cube of side a. The electric flux through the cube is
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A charge q μC is placed at the centre of a cube of side 0.1 m. Then the electric flux diverging from each face of this cube is
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Gauss law is given by 0 E.ds=q, if net charge enclosed by Gaussian surface is zero then-.

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An uncharged conductor A is brought close to another positive charged conductor B, then the charge on B
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The fig. shows lines of constant potential in a region in which an electric field is present. The value of the potential are written in brackets of the points A, B and C, the magnitude of the electric field is greatest at the point -

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Which of the following represents the correct graph for electric field intensity and the distance r from the centre of a hollow charged metal sphere or solid metallic conductor of radius R:
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A neutral spherical metallic object A is placed near a finite metal plate B carrying a positive charge. The electric force on the object will be
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The figure shows a thick metallic sphere. If it is given a charge +Q, then an electric field will be present in the region

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