A copper wire of length $\mathrm{L}$ ' and diameter $D$ ' is to be reshaped into another wire so as to have…

A copper wire of length $\mathrm{L}$ ' and diameter $D$ ' is to be reshaped into another wire so as to have minimum resistance. For this we should
  1. increase $L$ and decrease $D$.
  2. decrease $\mathrm{L}$ and increase $\mathrm{D}$.
  3. decrease both $L$ and $D$.
  4. increase both $L$ and $D$.

Solution

Decrease L and increase D

Asked in: MHT CET 2020 (14 Oct Shift 2)

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