Question

the radius of a copper wire is 1 mm.calculate the length of the wire needed for having a resistance of 1 ohm.the specific resistance of copper wire is 1.76×10^-6 ohm cm

Answer 1

here is your answer please mark it is as the brainliest

is it correct??

Answer 2

here,

resistivity- 1.76*01^-8 ohm m

r= 1mm = 1* 10^-3 m

R= 10.5 ohm

l= ?

Area= pie* r^2

= 3.14*10^-6

R= rho*l/Area

l = RA/rho

= 10.5*3.14*10^-6/ 1.76*10^-8

= 1873.2 m

hope this will help you