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# Point in opposite directions and have equal

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Unformatted text preview: hether it is possible for the magnitudes to be equal. As an example, consider the point directly between the two charges. Which st magnitude ﬁeld directly between the two charges? 8/19/09 7: Name__________________________________ 7. (2 pts) Two charged particles are located as shown. The dot simply represents a location in space. The direction of the electric field due to the two charges at the location indicated by the dot is a. up b. down c. right d. left e. zero 8. An uncharged insulator is placed in a uniform electric field between two oppositely charged parallel plates. The charges in the individual molecules realign as shown in the diagram. On the diagram, sketch the electric field lines for the two oppositely charged plates. Draw the plates and indicate the charge distribution on them. (4 pts) -+ -+ -+ -+ -+ -+ -+ -+ -+ -+ -+ -+ 9. Two equal and opposite charges are located as shown in the diagram below. The magnitude of each charge is 1.0 nC . The dot simply represents a location in space. + 1.0 cm 1.0 cm Determine the electric potential at the location indicated by the dot. (7 pts) Name__________________________________ 10. In the figure at right, the dashed lines represent equipotential lines arising from source charges (not shown). The two dots simply represent points in space. On the diagram, draw vectors representing the electric field at each of those two points in space, carefully showing the correct direction and relative magnitudes of the electric fields at the two points. (3 pts) +20 V +10 V 0 V 11. In the figure at right, the arrows represent the electric field created by source charges (not shown). The three labeled dots simply represent points in space. Now imagine placing a +1.0 nC 1 charge at each of the three labeled points. 2 3 Rank the magnitudes of the forces experienced by the charges at the three points, from greatest to least. (3 pts) 12. Two parallel conducting plates 0.10 m apart are connected to the opposite terminals of a 300 ­V battery, resulting in a potential difference of 300 V between the plates. The area of each plate is 0.50 m2. a. Determine the magnitude of the electric field between the plates. (4 pts) b. Determine the amount of work that would be required to move a +0.010 C charge from the negative plate to the positive plate. (3 pts) (c ­d) Now the plates are moved closer together, while the battery remains connected to the plates. c. Does the magnitude of the electric field between the plates increase, decrease, or stay the same? Explain your reasoning. (3 pts) d. Does the amount of charge on the plates increase, decrease, or stay the same? Explain your reasoning. (3 pts) Name__________________________________ (13 ­15) When the switch is closed, 13. (2 pts) Bulb D a. gets a lot brighter b. stays about the same brightness c. gets much less bright 14. (2 pts) …and the current through the battery approximately a. doubles b. stays the same c. drops in half 15. (2 pts) …and the potential difference across bulb D approximately a. doubles b. stays the same c. drops in half 16. (2 pts) In the circuits at right, how do the currents through the two bulbs 1 and 2 compare? a. 1 > 2 b. 1 < 2 c. 1 = 2 17. (2 pts) Compare the brightness of the bulbs in the circuit at right. a. A = B = C b. A > B > C c. A > B = C d. B = C > A 18. How would you predict the brightness of A in the circuit at left (a) to compare with the brightness of A in the circuit at right (b)? Explain your reasoning. (3 pts) 2 1...
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