A curved resistor of uniform resistivity \(\rho\) is formed from a section of a coaxial cylinder of height \(h\), inner radius \(a\), and outer radius \(b\), subtending an angle \(\theta_0\). Two conducting flat rectangular plates are attached to the radial end faces at \(\theta = 0\) and \(\theta = \theta_0\), maintaining a uniform potential difference across them such that current flows azimuthally along concentric circular arcs. Which of the following expressions represents the electrical resistance \(R\) between the two conducting end faces?