An air-insulated parallel-plate capacitor of capacitance C₀ is charged to voltage V₀ and then disconnected from the charging battery. A slab with dielectric constant k and thickness equal to the capacitor spacing is then inserted halfway into the capacitor (Fig. 23.16). Determine(a) the new capacitance,(b) the stored energy,(c) the force on the slab in terms of C₀, V₀ , k, and the plate length L.

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FIGURE 23.16 Problems 64 and 65