# A wire has resistance of 8 ohm . If its length is made half by folding, find its resistance after the free ends are connected to each other?

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let's take length as L

and cross section area as A

here we need to use the formula R= rho(L/A)

here rho (as i didn't find the Greek symbol for it) stands for resistivity

as length is halved and r the radius is increased by two

R is reduced to R/4=8/4=2 ohm

so new resistance will beĀ 2 ohm