Directions. Show complete solutions and box final answers with correct units. 1. PROBLEM #1 (page 586) 17.1 Electric Current 17.2 A Microscopic View: Current and Drift Speed 1. A certain laboratory experiment requires an aluminum wire of length of 32.0 m and a resistance of 2.50 0 at 20.0'C. What diameter wire must be used? 1.. fen Off . and transfer 1 on x 2. PROBLEM #5 (page 586) 5. V If a current of 80.0 mA exists in a metal wire, (a) how many electrons flow past a given cross section of the wire in 10.0 min? (b) In what direction do the electrons travel with respect to the current?3. PROBLEM #19 (page 587) 19. BIO A person notices a mild shock if the current along a path through the thumb and index finger exceeds 80. HA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 4.0 X 10' 0 and a wet-skin resistance of 2.0 k!). 4. PROBLEM #25 (page 587) 25. At 20.0'C, the carbon resistor in an electric circuit connected to a 5.0-V battery has a resistance of 2.0 X 10 0. What is the current in the circuit when the temperature of the carbon rises to 80.0'C? on non5. PROBLEM #32 (page 587) 32. A platinum resistance thermometer has resistances of 200.0 0 when placed in a 0'C ice bath and 253.8 0 when immersed in a crucible containing melting potassium. What is the melt- ing point of potassium? Hint: First determine the resistance of the platinum resistance thermometer at room tempera- ture, 20.0 C. 6. PROBLEM #51 (page 588) Additional Problems 51. Consider an aluminum wire of diameter 0.600 mm and length 15.0 m. The resistivity of aluminum at 20.0 C is 2.82 x 108 0 . m. (a) Find the resistance of this wire at 20.0 C. (b) If a 9.00-V battery is connected across the ends of the wire, find the cur- rent in the wire