= Charge redistribution at a capacitor corner
A conducting <capacitor> plate must remain an <equipotential surface> in <electrostatic equilibrium>. Near a finite plate's edge or corner, the surrounding geometry differs from that at its center, so the <surface charge> generally redistributes rather than remaining uniform.
This redistribution supplies the local <electric field> needed to maintain the constant surface <electric potential>. A model with prescribed uniform sheets can estimate a <fringing field of a capacitor>, but its corner field need not be the field of actual conducting plates at the specified voltage. Solving the appropriate <boundary value problem> determines both field and surface charge; ideal sharp corners can introduce singular limiting charge densities.
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