Translational magnetic damping of a square wire loop
= Translational magnetic damping of a square wire loop
A square wire loop partly in a uniform field has linear drag $B^2a^2v/R$, giving velocity-relaxation time $\tau_t=mR/(B^2a^2)$. For uniform wire of mass <density> $\rho_m$ and resistivity $\rho_e$, $\tau_t=16\rho_m\rho_e/B^2$, independent of wire dimensions.