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 Electric Potential, Energy and... Practice Questions 2

1 .       The second of two capacitors has twice the charge and half the voltage. Its energy is [Hint]

 twice that of the first. four times that of the first. equal to that of the first one. six times that of the first.

2 .       The second of two capacitors has twice the charge and half the voltage. The capacitance of the second is [Hint]

 equal to that of the first. twice that of the first. four times that of the first. one-fourth that of the first.

3 .       A proton is accelerated from rest through a potential of 500 volts. Its final kinetic energy is [Hint]

 50 eV. 500 eV. 1000 eV. 2000 eV.

4 .       What is the final velocity of the proton in the previous problem? (The mass of the proton is 1.67x10-27 kg) [Hint]

 8x1014 m/s 1000 m/s 3x108 m/s 3x105 m/s

5 .       An alpha particle (Q=+2e) is accelerated from rest through a potential difference of 500 volts. Its final kinetic energy is [Hint]

 50 eV. 500 eV. 1000 eV. 2000 eV.

6 .       Two alpha particles are placed near each other so that each experiences a potential of 500 volts. They are allowed to fly far apart. What is the final potential of each? [Hint]

 zero. 500 volts. -500 volts. 250 volts.

7 .       What is the final kinetic energy of each alpha particle in the previous question? [Hint]

 500 eV 1000 eV 2000 eV zero

8 .

If Q1 and Q2 are equal and oppositely charged, what is the potential at point B? [Hint]

 zero negative positive Cannot be determined.

9 .       In the previous question the work required to move a positive charge from A to B is [Hint]

 zero. positive. negative. Cannot be determined.

10 .

If both charges in the figure are positive and the potential at B is 500 volts, what is the potential at A, 3 meters above the point B? [Hint]

 0 volts. 250 volts. 400 volts. 500 volts.

11 .

If Q1 in the above figure is twice Q2 and both are positive, where can a point of zero potential be found? [Hint]

 Between the two charges. To the right of Q2. To the left of Q2. At no finite distance from Q2 .

12 .       In the previous question if Q1 is negative and twice Q2 which is positive where will the potential be zero? [Hint]

 3.33 m to the left of Q1. 3.33 m to the right of Q1. 3.33 m to the left of Q2. 3.33 m to the right of Q2.

13 .
What is the equivalent capacitance of the two capacitors in series in the figure? [Hint]

 10 microF 20 microF 30 microF 40 microF

14 .       What is the charge on the 30 microF capacitor in the circuit in question 13? [Hint]

 40 C .00054 C 1389 C .00018 C

15 .       What is the voltage across C2 (above)? [Hint]

 18 V 12 V 9 V 6 V

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