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A curved rectangular bar forms a resistor. The curved sides are concentric circular arcs. If \( \rho \) is the resistivity of the material of bar, \( l_{0} \) is the length of inner arc of radius \( r_{0} \), \( \left(r_{0}+b\right) \) is the radius of the outer arc, and \( a \) is the width of the bar. The electric resistance of the bar across its rectangular ends is
(a) \( \frac{\rho l_{0}}{a r_{0}} \)
(b) \( \frac{\rho l_{0}}{a r_{0} \ln \left[1+\frac{b}{r_{0}}\right]} \)
(c) \( \frac{2 \rho l_{0}}{a r_{0} \ln \left[1+\frac{b}{r_{0}}\right]} \)
(d) None of these
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