Answer to Question #62965 in Physics for aftab ahmad

Question

(3.4) Suppose that any supercurrent flow corresponds to an
effective superfluid flow velocity v of the electrons, where
j = -en, v. Assume that the corresponding kinetic energy
is1/2 mv 2 n, per unit volume. Hence, using the results from, that the total energy
of a vortex line is roughly of order
E=Ф2/ 4πµ0 ln (λ2/ε0)
per unit length.