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V=亅嚈I/嚈t
Constant of proportion L is an amount in which the size of the self-inducement is shown and called "self inductance".
L = K亊兪亊兾亊a亊a亊N亊N/l
In this expression
K = Nagaoka coefficient
= magnetic permeability
a = radius of the coil (m)
N = number of rolling of the coil
l = length of the coil (m)丂丂丂仸"l " is the length of the coil as the object and not the length of the lead.

Since the normal-conductive loop of the superconductive electromagnetic engine is taking a round, it becomes N =1. The Nagaoka coefficient is near 1 and the radius and the length of the coil is near 1, too. So they are ignored. Then, it is the magnetic permeability that becomes a problem. Since the wick of the normal-conductive loop of the superconductive electromagnetic engine is empty, the magnetic permeability of the vacuum can be approximately used. The magnetic permeability of the vacuum is 4兾亊10-7. Therefore, the self inductance of the normal-conductive loop becomes about 兪H (micro Henry). Since micro is 10-6, even if 嚈I is tens of thousands of amperes, when 嚈t takes time from 1 second to several seconds, the induced electromotive force becomes small to the extent that cannot become a problem.

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