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Which mechanism limits capacitance when parallel-plate capacitor dielectric nears breakdown field strength?

A)Quantum tunneling through potential barrier
B)Dielectric saturation reducing permittivity
C)Electrostriction altering plate separation
D)Surface charge diffusion along electrodes

💡 Explanation

When a dielectric nears breakdown field strength, dielectric saturation occurs because dipoles are maximally aligned, reducing the material's permittivity and thereby lowering the capacitor's capacitance. Therefore reduction of permittivity results, rather than quantum tunneling, electrostriction, or diffusion, which have different dependencies.

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