A copper rod of length L=2.0m is formed into the shape of a truncated cone (frustum). The radius of the circular cross-section varies linearly from r1=2.0mm at the left end to r2=4.0mm at the right end. The resistivity of copper is ρ=1.7×10−8Ω⋅m. Calculate the total electrical resistance of this rod assuming current flows uniformly along the axis of symmetry.