A parallel plate capacitor of capacitance 6.0μF has the space between the plates filled with a slab of glass with k = 3.0. The capacitor is charged by attaching it to a 1.5-V battery. After the capacitor is disconnected from the battery, the dielectric slab is removed. Find
(a) The capacitance,
(b) The potential difference,
(c) The charge on the plates,
(d) The energy stored in the capacitor after the glass is removed.

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15 V 3) glass