13. Equiponlential lines are always A. Parallel to electric field lines B. perpendicular to charged surface C. Perpendicular to electric field lines D. circular 14. Electric potential is A. a vector quantity B. is proportional to the work done in an electric field C. is always equal to the electric field D. is measured in N/C 15. The potential difference between two points is 100 V. If a particle with a charge of 2C is transported from one of these points to the other, the magnitude of the work done is A. 200J B. 100 J C. 50 J D.2J 16. Currentis a measure of A. force that moves a charge past a point B. resistance to the movementof a charge pasta point C. energy used to move a charge past a point D. amount of charge that moves past a point per unit time 17. The current in a wire A. depends only on the potential difference applied B. depends only on the resistance of the wire C. depends on both resistance and potential difference D. does not depend on resistance and potential difference 18. As the temperature of a certain material is increased, its resistance A. decreases B. increases C. stays the same D. none of these 19. In order to form an electric circuit, you need to have A. wires or conductors to connect everything. B. a power source. C. a light bulb or some resistance. D. all of the above 20. The influence thatmakes currentto flow from lower to higher potential is called A. magnetic force B. electrom olive force C. electric force D. reactive force 21. If two elements of a circuit are in series, they must have the same A. current B. vollage C. resistance D. charge 22. If two elements of a circuit are in parallel, they must have the same A. current B. vollage C. resistance D. charge 23. Kirchoff's law of vollages states that in a complete circuit, A. The sum of vollage decreases equals the sum of vollage increases. B. All paths in a circuithave equal vollage increases. C. All electrons must travel the same path. D. Electrons provide the necessary vollage for the circuit to operate. 24. Two capacitors (20F and 3 uF) are connected in series with a voltage source of 20 V. What is the voltage drop across the 3uF capacitor? A. 4V B. BV C. 12 V D. 16 V 25. A ballery is connected to a resistor. Increasing the resistance of the resistor will A. increase the currentin the circuit B. decrease the current in the circuit. C. not affect the currentin the circuit D. none of these 26. Two resistances R, and Ra give combined resistance of 4.5 Q when in series and 1 Q when in parallel. The resistances are A. 3 0 and 6 0 B. 3 0 and 9 0 C. 1.5 0 and 30 D. 1.5 0 and 0.5 0