Решение на момент правки #16001 от , автор Nólëmacil. Это не текущая версия.
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Statement

11.5.19. [Insert the problem statement]
A long metal tube has a section of radius radius r1 and a section or radius r2. It is placed along a uniform magnetic field that has the induction B.
How much energy of a superconductive bullet of radius r0 and length L that flies along the tube axis, change it when it crosses the boundary between tubes sections of various radius. Ignore friction and all other minor effects.

For problem $11.5.19$

Solution

For problem $11.5.19$
For problem
For problem $11.5.19$
For problem

Answer

(L*B^2/2*u)*((r2)^4/((r2)^2-(r0)^2)(r1)^4/(r1)^2-(r0)^2)
[Insert a concise answer or boxed result]