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. In Dirac’s theory, the probability current density is defined by the relation j(r, t) = CΨ* αΨ ,
where Ψ is the four component wave vector. Write the relations for jx, jy, jz in terms of the
component of Ψ i.e.
J(r, t) = Ψ*α Ψ ; jx = C Ψ* αx Ψ