The resistance of a conductor with a diameter of 2mm is 20 ohms. If the diameter is doubled with length remaining the same, the new resistance, becomes
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Resistance is inversely proportional to the area of cross section.
When diameter is doubled, area becomes 4 times as A=π(d/2)²
So resistance should become 1/4 times i.e. 20/4=5 ohms
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