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the area of cross section of a conductor is 2 mm 2 and its resistance is 20 . what will be the resistance wen its length is double ? |
| Ans : The resistance of a conductor, R = (k L)/ A K - resistivity ( a constant value) L - length A - area of cross section ie, Resistance is directly proportional to length , it gets doubled. New resistance = 2 R = 40 ohm |
