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| 1. |
A conductor has a cylindrical shape with a diameter . Its resistance is 2 Ω. It is recast into a cylindrical conductor of diameter 0.3. The resistance of new conductor is likely to be |
| Answer» Since new diameter is 0.3 d, the new area of cross-section a (0.3 d)2. The volume remains the same. Therefore length increase by a factor . Hence . | |