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Physics Review Question Unit: magnetism Year: 1988 Question#: 30 Question: If both the cross-sectional area and the length of a metallic conductor were doubled, the resistance of the conductor would be (1 ) halved (2 ) doubled (3 ) unchanged (4 ) quadrupled What is this question really asking? Explanation by: Cory V [ Return to question menu ] Answer 1 halved INCORRECT The resistance would be unchanged because the increase in cross sectional area is cancelled out by the increased length. return to top Answer 2 doubled INCORRECT The resistance is unchanged because the cross sectional area increases as the length does also. return to top Answer 3 unchanged CORRECT The resistance is becoming greater as the length increases, but lessens as the cross-sectional area widens. return to top Answer 4 quadrupled INCORRECT There is no change because the length is increasing at the same time that the cross sectional area is getting wider, they cancel each other out. return to top What's this question really asking? What happens to the resistance of a conductor if the cross sectional area and the length are both doubled? return to top |
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