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(m A copper wire has a resistance of 200 ohms. A second copper wire with twice the crosssectional area and the e length will have a resistance of 5am (1) son (3) 2000 (2) man (4) 4000 Proof: Explain your reasoning / show calculations. _______________._.--- 7. if the cross-sectional area and length of a conductor were quadrupled, the resistance of the conductor would be (1) halved (3) doubled (2) quadrupled (4) unchanged Proof: Explain your reasoning / show calculations. ______________- 8. Four wires of the same length and cross-sectional area are made of different materials: gold, aluminum, tungsten, and nichrome. Which of the four wires has the greatest resistance? (1) gold (3) tungsten (2) aluminum (4) nichrome Proof: Explain your reasoning / show calculations