Question

resistance of metal of length 5 m is 100​

Answer 1

Use formula R= rho*l/area of cross section

Answer 2

Resistance=( resistivity × length)/ area

given,

length=5m

resistance= 100ohm

area= 3× 10^-7 m^2

Now,

resistivity = ( Resistance× area)/ length

= ( 100 × 3×10^-7)/5

= 6× 10^-6 ohm/m