What is the sheet current density K (in units of amperes per cm) that will be generated on the surface of a cylindrical superconductor with radius 2 cm, according to (11.10.4), assuming all the current flows within one London penetration depth of the surface? Assume that the sheet current effectively makes a solenoid that generates magnetic field in the opposite direction of the applied magnetic field.

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VxJ = noq² -B. m (11.10.4)