A parallel-plate capacitor stores charge Q. The capacitor is then disconnected from its voltage source, and the space between the plates is filled with a dielectric of constant ? = 2 . What is the relationship between the stored energies of the capacitor, where PEi is the initial stored energy, and PEf is the stored energy after the dielectric is inserted?
a. PEf = 0.25PEi
b. PEf = 0.5PEi
c. PEf = PEi
d. PEf = 2PEi
b
Physics & Space Science
You might also like to view...
If the Moon were covered with water, tidal effects caused by Earth would find the Moon with
A) 1 tidal bulge. B) 2 tidal bulges. C) 3 tidal bulges. D) 4 tidal bulges. E) no tidal bulges.
Physics & Space Science
In organic molecules, a carbon atom will normally form how many bonds?
a. 1 b. 4 c. 3 d. 2 e. 0
Physics & Space Science
The number of cycles of a wave passing a point per unit time is the wave's
a. speed. b. frequency. c. wavelength. d. amplitude. e. loudness.
Physics & Space Science
An object of mass m is suspended by two coplanar wires, as shown below. The tension in each wire has a magnitude given by
A.
.B.
.C.
.D.
mg.
E.
.
Physics & Space Science