題組內容

2.(15%) Figure P2 shows a capacitor consisting of two square parallel, conducting p gth w separated by a distance d. Charges +Q and -Q are placed on the plates, an supply is then removed. A solid dielectric slab of permittivity s is inserted a distance x into the capacitor. Assume d is much smaller than x.
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(c) Find the force exerted by the plates on the solid dielectric slab. (5%)