A copper wire with length $L$ and radius $r$ has a resistance $R.$ What is the radius of a copper wire with length $2L$ and resistance $R?$

a$.\frac{r}{2}$

b$.r*\sqrt[\phantom{2}]{?}2$

c$.2r$

d$.\frac{r}{\sqrt[\phantom{2}]{2}}$

Answer rating: 100% (QA)

To find the radius of a copper wire with length 2L and resistance R we can use the formula ... View the full answer