Dielectrics: a Parallel-Plate Capacitor Has a Capacitance of 10 MF

question 20

Multiple Choice

Dielectrics: 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 material of dielectric constant 4.0 is used to fill the space between the plates. How much energy is now stored by the capacitor?

• A) 250 mJ
• B) 125 mJ
• C) 500 mJ
• D) 62.5 mJ
• E) 1200 mJ

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