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 Electric Potential, Energy and... MCAT Study Guide

 1 . 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. 2 . 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. 3 . 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. 4 . 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. 5 . 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. 6 . 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. 7 . The electric potential at point p2 (relative to infinity) is ___ the electric potential at point p5 (relative to infinity). 8 . 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 ___. 9 . The potential difference between points p5 and p1 is ___. 10 . If the magnitude of the charge q1 was increased slightly, the difference in electric potential between points p3 and p8 would ___. 11 . 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 ___. 12 . 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. 13 . The magnitude of the electric potential difference between pairs of labeled points is greatest for the pair of points ___. 14 . The following information pertains to questions 14 and 15. A potential difference Vo is applied to a capacitor with capacitance Co. The charge separated on the capacitor is then qo, and the energy stored in the capacitor is Eo. If the potential difference across the capacitor is increased to 2 Vo, . . . . . . the charge separated on the capacitor will be qo x ___. 15 . . . . the energy stored in the capacitor will be Eo x ___. 16 . The following information pertains to questions 16 and 17. A potential difference Vo is applied to a capacitor with capacitance Co. The charge separated on the capacitor is then qo, and the energy stored in the capacitor is Eo. If this same potential difference was applied to a second capacitor with capacitance C2 (< Co), the charge separated on this second capacitor would be ___ qo. 17 . If this same potential difference was applied to a second capacitor with capacitance C2 = 2 Co, the energy stored in this second capacitor would be E = Eo x ___. Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.

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