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.
C
You might also like to view...
The type of EM radiation that has wavelength just a bit longer than that of visible light is __________
Fill in the blank(s) with correct word
Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that can shoot pebbles at 40 m/s. Velma shoots a pebble toward the rear of the train. Velma observes the pebble's velocity to be
A) 10 m/s south. B) 10 m/s north. C) 40 m/s south. D) 70 m/s south. E) 70 m/s north.
If you need 3.01 × 1023 molecules of sucrose, how many liters of a 4.00 molar solution would you need?
A) 0.125 L B) 0.250 L C) 4.00 L D) 1.00 L E) none of the above
A 80. volt DC motor draws 4.0 A at its operating speed of 1500. rpm with an armature resistance of 4.0 ?
(a) What is the starting current? (b) What is the back emf when running normally? (c) What series resistance could be added to limit the starting current to 10. A?