Abstract
Abstract Two simple, fast methods to calculate the penetration time of a longitudinal magnetic field through the wall of a long metallic tube of circular cross section are presented. The first method is based upon the proposition of an “effective penetration thickness” given by the polar angle average of all possible straight-line transverse penetration paths of field lines through the tube wall. In the second method the tube is considered as an RL circuit; thus the penetration time is given by the ratio L T / R T where L T and R T are the inductance and resistance of the cylinder, respectively.
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