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The field potentail in a certain region...

The field potentail in a certain region of space depends only on the `x` coordinate as `varphi = -ax^(2) + b`, where `a` and `b` are constants. Find the distribution of the space charge `rho (x)`.

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PHYSICS GALAXY - ASHISH ARORA-ELECTROSTATICS-Unsolved Numberical Problems
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