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A uniform surface charge of density sigm...

A uniform surface charge of density `sigma` is given to a quarter of a disc extending upto infinity in the first quadrant of x-y plane. The centre of the disc is at the origin O. Find the z-component of the electric field at the point `(0, 0, z)` and the potential difference between the points `(0, 0, d)` & `(0, 0, 2d)`.

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The correct Answer is:
`sigma/(8 in_(0)), sigma/(8 in_(0)) |d|`
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