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 Electric Potential, Energy and... Practice Questions 1

1 .       Which of the following is not a unit for the electric field? [Hint]

 N/C V/m V/C J/Cm

2 .       A 9 volt transistor battery has [Hint]

 more energy available than a 6 volt lantern battery. more energy available than a 1/1/2 volt flashlight battery. more energy available per charge moved than a 6 volt lantern battery all of the above. none of the above.

3 .       The unit of capacitance is the [Hint]

4 .       The unit for the dielectric constant is [Hint]

 Cm. J/C. V/m. None of the above.

5 .       A farad is [Hint]

 C/V. V/C. N/m. CV.

6 .       A capacitor has circular plates of radius 10 cm separated by 1 mm. Its capacitance is [Hint]

 8.85x10-12 F. 2.78x10-13 F. 1.11x10-9 F. 2.78x10-10 F.

7 .       A capacitor has circular plates of radius 10 cm separated by 1 mm. If the capacitor is connected to a 12 volt battery, the charge on the capacitor will be [Hint]

 3.34x10-9 C. 2.5x10-12 C. 1x10-6 C. 12x10-12 C.

8 .       What is the electric field in the capacitor in the previous question? [Hint]

 12 N/C .012 N/C 12000 N/C 120 N/C

9 .       What would be the energy stored in the capacitor in the previous question? [Hint]

 0.02 microJ 1.7 nanoJ 4x10-8 J 3.1 mJ

10 .       A dielectric is inserted into the capacitor in the previous question and the stored energy is found to be 0.092 microJ, the dielectric is [Hint]

 air. paper. Teflon. Glass.

11 .       Capacitor 1 has capacitance C1 and voltage V1. Capacitor 2 has twice the capacitance and the same voltage. Its energy U2 equals [Hint]

 2U1 4U1 U1 6U1

12 .       Capacitor 1 has capacitance C1 and voltage V1. Capacitor 2 has twice the voltage and the same capacitance. Its energy U2 equals [Hint]

 2U1 4U1 U1 6U1

13 .       Two capacitors have the same capacitance but the second has twice the charge of the first. Its stored energy is [Hint]

 equal to twice that of the first. equal to four times that of the first. equal to the energy of the first one. equal to eight times that of the first.

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