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The gap between the plates of a parallel...

The gap between the plates of a parallel plate capacitor having square plate of edge `a` and plate separation `d` is filled with a dielectric of dielectric constant `K` .`K` varies parallel to an edge as `K=K_(0)-ax` where `k` and a are positive constants and `x` is the distance from one end.The value of alpha for which capacitor behaves as a capacitor of zero capacitance will be

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