7. The graph below shows the current-versus-potential-difference relationship for a resistor. What is the resistance of the resistor? I(A) 5.0- 2.5- AV (V) a. 5.0 2 b. 2.02 8. The electric field in a conducting wire is 10 C. 1.02 d. 0.5 2 a. Non-zero only when there is a potential difference across its ends. b. Zero only when there is a potential difference across its ends. c. Zero all the time. d. Non-zero all the time. 9. A wire carries a 16 A current. What is the current in a second wire that delivers half as much charge in twice the time? a. 16 A b. 8 A c. 4 A d. 2 A 10. A wire with a cross sectional area A carries current 1. What is the magnitude of the current density in the wire? a. IA b. A C. A/1 d. I 11. Current flow in a metal conductor is due to the motion of a. Only electrons. b. Only ions. b. Both ions and electrons. 12. The switch in the circuit can be set to connect to any one of the points A, B or C at a time. Which of these connections will provide a complete circuit? ww a. Only B. b. Only C. A OB moco c. B and C. d. A, B and C. www