A parallel-plate capacitor has a capacitance of 10 mF and is 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 voltage now across the capacitor is A)
zero.
B)
20 V.
C)
5 V.
D)
10 V.
E)
80 V.
C
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