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A parallel plate capacitor of capacitance 7.2 µF has the space between the plates filled with a slab of glass with ? = 3.5. The capacitor is charged by attaching it to a 1.2-V battery. After the capacitor is disconnected from the battery, the dielectric slab is removed.

(a) Find the capacitance after the glass is removed. F

(b) Find the potential difference after the glass is removed. V

(d) Find the energy stored in the capacitor after the glass is removed. J

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