A magnetic field is created inside the conducting cylindrical shell. The shell is informed of the velocity v in such a way that it begins to contract towards the axis without losing its symmetry. Find the maximum magnetic field induction that can be obtained in this way if the initial induction B = 10 T, v = 3 km/s, the initial radius of the shell r = 20 cm, its thickness ∆ = 0.5 cm, and the density of the shell material ρ = 8.9 g/cm³. Find the maximum magnetic pressure acting on the shell. Ignore the electrical resistance of the shell.
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