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A ring radius a = 50 mm made of thin w...

A ring radius `a = 50 mm` made of thin wire of radius `b = 1.0 mm` was located in a unifrom magnetic field with induction `B = 0.50 mT` so that the ring place was perpenficular to the vector `B`. Then the ring was cooled down to superconducting state, and the magnetic field was swichted off. Find the ring current after that. Note that the inductiance of a thin ring along which the surface current flows is equal to `L = mu_(0)a (In (8a)/(b) - 2)`.

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