6. . You nd a long silver metal rod with a circular crOSS-section and you measure its cross-section diameter to be 1 mm. You set the rod up in a way that a current of 2 A passes through its cross-section. The free-electron density of silver is 5.9 x 1023 m'3 . Given this information, what is the magnitude of the drift speed of the electrons owing in the rod? (Express the speed in mm/s with two decimal places) a) 6.74 x 10 "amm/s c) 2.11 mm/s b) 0.27 mm/s d} 2.70 x 10 "'mm/s 7. . Consider the circuit as shown in the diagram. Using the current directions set in the diagram, what are the values for 1,, 12, and I;? a) 1 = 2.17A, 12 = 4.00A, 13 = 1.83A b) 1, = 1.50A, 12 = 2.00A, 13 = 0.500A R1 = 80 c) 11 = 0.346A, 12 = 3.45A, 13 = V, = 10 V 3.19A V, = 24 V 1 d) 1 = 4.50A, 12 = -2.00A, 13 = 6.50A R2 = 60 R2 = 40) 12 10. . A 500. -0 resistor, an uncharged 2.00 uF capacitor, and a 10.0 - V emf source are connected in series. How much charge does the capacitor store after one time constant? a) Zero c) 1.73 x 10-5C b) 1.26 x 10-5C d) 2.00 x 10 5C1. . The gure shows three paths along which we can move a negatively charged sphere A closer to a positively charged sphere B, which is fixed in place. Which of the following correctly describes the minimum work done by an external force in moving Sphere A closer to sphere B? 3 a} W2 > W3 > W1 :4 ...... b) W1 > W3 > W2 J: \"a .. C) W1 > W2 > W3 5' "1 dl W1 = W2 = W3 1:12: I s a - q. - ~.-..a' 'Olnt'- 2. . Consider a parallel square-plate capacitor in vacuum being charged by a battery. After charging, the battery was removed. The plate separation distance of the capacitor is reduced by a factor of 0.80 and is then inserted with a dielectric with a dielectric constant of 3.80. By what factor does its potential energy change? a} 0.17 c) 0.26 b) 0.21 d] 0.33 4. . The two identical square piates of a parallel plate capacitor in vacuum have a separation distance of 0.050 mm so that the capacitance is measured as 0.870 nF. Suppose this capacitor is to be refashioned into a cylindrical capacitor instead. This is done by using one plate for the outer cylinder, while the other plate is stripped by removing a quarter length on one side with the remaining piece used to create the inner cyiinder. What will be the capacitance of this cylindrical capacitor? a) 1.355 x 10'11 Farad c) 2.812 x 10'12 Farad b) 9.500 x 10'13 Farad d) 8.700 x 10'1\" Farad