Linear Current-Voltage Characteristics in Type-II Superconductors Under Conditions of Flux Flow

The recent suggestion that the flux-flow current-voltage characteristics of Type-II superconductors can be described by the relation $\ln I\propto V^{\frac{1}{2}}$ is shown to be inadequate over an extended range of currents. The previously reported linear relationship between $I$ and $V$ is found to hold and the present ideas about flux flow remain unchallenged.