The electric conductivity owing to collisions of charged particles in the core of a magnetized neutron star is re-examined. Standard processes of longitudinal plasmon exchange in particle collisions are taken into account along with the exchange of transverse plasmons. The latter processes are important for collisions of relativistic particles but they have never been included in previous studies of the electric conductivity. It is shown that their inclusion modifies the electric conductivity, in particular, its temperature dependence. For example, the temperature dependence of the electric resistivity along the magnetic field in the low-temperature limit becomes R_|| ∝ T^5/3 instead of the standard dependence ∝ T² for degenerate Fermi-systems). The effect of possible neutron or proton superfluidity in a neutron star core on the electric conductivity is briefly described, and various scenarios of magnetic field evolution in neutron stars are discussed.

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