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A certain piece of copper is to be shaped into a conductor of minimum resistance. Its length and diameter should be respectively

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By Expert Faculty of Sri Chaitanya
a
I,d
b
2l,d
c
l2,2d
d
2l,d2

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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 largest
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