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The following information pertains to Questions 1–4. "The electric potential difference between points a and b is +10 volts. (The language of physics is very specific here. The electric potential at point a relative to infinity, or any other point, is greater than the electric potential at point b relative to the same reference point.)" A proton is initially at rest at point b. The work required of you to move this proton to point a and it still be at rest is ___ eV.
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| +10 |
| -10 |
| some other value |
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A proton is initially at rest at point a. The work required of you to move this proton to point b and it still be at rest is ___ eV.
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| +10 |
| -10 |
| some other value |
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An electron is initially at rest at point b. The work required of you to move this electron to point a and it still be at rest is ___ eV.
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| +10 |
| -10 |
| some other value |
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An electron is initially at rest at point a. The work required of you to move this electron to point b and it still be at rest is ___ eV.
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| +10 |
| -10 |
| 0 |
| some other value |
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The following information pertains to Questions 5–10.  "Consider the electric potential is the space around a single point charge q1 (>0). The figure at the right shows such a point charge and locates and labels several points in the space around it. The points labeled p1, p2, and p3 are on a circle of radius Ro centered on the point charge. Points p4, p5, and p6 are all a distance 2 Ro from the point charge and the points labeled p7, p8, p9, and p10 are a distance 3 Ro from the point charge. The points p1, p3, p4, and p10 lie along a straight line containing the point charge."
The electric potential difference between points p3 and p4 is ___ the electric potential difference between points p4 and p10.
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| equal to |
| less than |
| more than |
| incomparable, without additional information, with |
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The work required to move a small charge q* (>0) from point p4 to point p2 is ___ the work required to move the same charge from point p6 to point p2.
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| equal to |
| less than |
| more than |
| incomparable, without additional information, with |
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The electric potential at point p2 (relative to infinity) is ___ the electric potential at point p5 (relative to infinity).
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| equal to |
| less than |
| more than |
| incomparable, without additional information, with |
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If the work required to move a small charge q' (>0) from point p10 to point p3 is Wo, the work required to move a charge 2 q' from point p10 to point p3 is Wo x ___.
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| 1 |
| 2 |
| 1/2 |
| 3 |
| 1/3 |
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The potential difference between points p5 and p1 is ___.
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| a negative number |
| a positive number |
| zero |
| . . . gosh. There is no way to tell. |
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If the magnitude of the charge q1 was increased slightly, the difference in electric potential between points p3 and p8 would ___.
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| increase |
| decrease |
| remain constant |
| be impossible to predict |
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The following information pertains to Questions 11–13.  "In the figure at the right, two point particles have net charges q1 = 2 qo (>0) and q2 = -qo. The points labeled p1 through p5 lie along the same line as the particles and are equidistant from each other and or the nearer particle."
Of the labeled points, the electric potential is greatest at the point labeled ___.
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| p5 |
| p4 |
| p3 |
| p2 |
| p1 |
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The work required to bring a small charge q* (>0) from infinity and place it at the point labeled p3 is ___ the work required to bring the same charge from infinity and place it at the point labeled p2.
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| more than |
| less than |
| equal to |
| incomparable with |
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The magnitude of the electric potential difference between pairs of labeled points is greatest for the pair of points ___.
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| p1 and p2 |
| p1 and p3 |
| p1 and p4 |
| p1 and p5 |
| p2 and p3 |
| p2 and p4 |
