A Parallel-Plate Capacitor Has a Capacitance of 10 MF and Charged

question 56

Multiple Choice

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

• A)250 mJ.
• B)125 mJ.
• C)500 mJ.
• D)zero.
• E)62.5 mJ.

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