A parallel-plate capacitor has a capacitance of 10 mf and, Ask an Expert

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A parallel-plate capacitor has a capacitance of 10 mF and charged with a 20 V power supply. The power supply is then removed and a dielectric of dielectric constant 4 is used to fill the space between the plates. The energy now stored by the capacitor is

125 mJ.
250 mJ.
500 mJ.
62.5 mJ.
zero.

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