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Comments: 4 pages RevTeX, 4 Postscript figures. References added. We study atwo-dimensional granular superconducting network at the percolation thresholdunder the influence of an external perpendicular magnetic field. By numericalsimulations on the full nonlinear problem, we determine the scaling exponentfor the magnetic susceptibility. Further, we report on the scaling propertiesof the current distribution. The scaling of the current is found to beindependent of the value of the magnetic field. Our results are incontradiction with previous numerical results based on linearized equations. Wefind a value for the susceptibility exponent which does not agree with existingtheoretical suggestions, but agrees perfectly with renormalization groupcalculations

Diamagnetic susceptibility and current distributions in granular superconductors at percolation