Question

resistance of a metal wire of length 1m is 26 ohm at 20° C .If the diameter of the wire is 0.3mm, what will be the resistivity of the metal at that temperature? ​

Answer 1

R= resistivity×length/area , R= 26ohm, length is 1 m, Area = πr^2( π× 0.3×0.3×10^-6) , put the value in formula . 26= resistivity× 1/3.14×0.3×0.3×10^-6 after solving it resistivity is 7.05×10^-6

Answer 2

Answer:

R= resistivity *length/area

R= 26Ω

length= 1 m

Area= πr²( π× 0.3×0.3×10⁻⁶)

Now,

put the value in formula .

=> 26= resistivity× 1/3.14×0.3×0.3×10⁻⁶

Hence, after solving,          

Resistivity= 7.05×10⁻⁶