Questions
A certain piece of copper is to be shaped into a conductor of minimum resistance. Its length and diameter should be respectively
detailed solution
Correct option is C
We know thatR=ρlπr2 or R=4ρlπd2∴ R∝ld2For minimum resistance l should be smallest and d should be largestTalk to our academic expert!
Similar Questions
In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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