Question

Calculate the area of cross section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 × 10−6Ω m.

Answer 1

A =RHO × L÷R = 184×10^-6-2×1÷23 = 8×10^-8 m

Answer 2

A=rho×l÷r
  =(1.84×10⁻⁶×1)/23
  =(184×10⁻⁸)/23
  =8×10⁻⁸m²