Question

The resistivity of copper is 1.7 x 10^-8 what lenghth of copper wire of diameter 0.1 mm will have a resistance of 34 ohm and another copper wire of the same length but of half the diameter as the first is taken what is the ratio of its resistance to that of the first wire

Answer 1

$\frac{r2}{r1} = 4$

Answer 2

Answer:

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