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cse โ€ข paper_1 โ€ข electrodynamics

[UPSC CSE 1999] Electrostatics and Magnetostatics (Q233, 20M)

A potential field is given by: \phi = (x^2 + y^2 + z^2)\text{ volt.} Find the electric field at a point (x, y, z) and the charge density in the region.

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