26. A 3 mm gap between the square metal plates of area 0.25 m2 that form a parallel-plate capacitor is

26. A 3 mm gap between the square metal plates of area 0.25 m2 that form a parallel-plate capacitor is partly filled as shown by 2 dielectric slab of the same shape and area, of thickness 2 mm and relative permittivity 2.5. Ignoring edge effects, calculate the capacitance when the dielectric slab is partly withdrawn a distance 0.2 m in a direction parallel to an edge of the plates.

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