Question

Solve the following problem

Answer 1

we know that
      resistivity (r)=rho l/a
here given that 
     resistivity (rho)=5*10 to the power -8
               length(l)=50m
                 area(a)=0.01m*2
       according to the formula = 5*10to the power -8 * 50/0.01
                                               = 250 * 10 to the power -8/0.01
                                                =25000 * ten to the power -8
                                                =250 8 ten to the power -10.