  Motivated by recent experiments showing over $10^4$-fold increase in induced
polarization from electrochemically inert, conducting materials in dilute
saline solutions, we theoretically demonstrate a new mechanism for dielectric
enhancement, in the absence of $\zeta-$potentials at interfaces between
non-insulating particles and an electrolyte solution. We further show that the
magnitude of such enhancement obeys universal scaling laws, independent of the
particle's electrical properties and valid across particle shapes: for a dilute
suspension of identical, but arbitrarily shaped particles of a linear dimension
$a$ and volume fraction $f$, as $\omega\to0$ the effective real dielectric
constant of the mixture is enhanced from that of water by a factor
$1+f~(P_r+(a/\lambda)P_i)$, and the frequency-dependent phase shift of its
impedance has a scale-invariant maximum $f\,\mathsf{\Theta}$ if particles are
much more conductive than the solution. Here $\lambda$ is the solution's Debye
length and $P_r$, $P_i$, $\mathsf{\Theta}$ are dimensionless numbers determined
solely by the particles' shape. Even for a very dilute electrolyte solution
(e.g. $10^{-3}$ molar), sub-mm sized particles, at volume fraction $f=0.1$, can
give a $10^4$-fold dielectric enhancement, producing an easily observable phase
shift maximum in a simple impedance measurement.We also derive frequency
cutoffs as conditions for observing these enhancements, showing that insulating
particles produce no enhancement without $\zeta$-potential.To prove these
results for particles of arbitrary shapes, we develop a physical picture where
an externally induced double layer (EIDL), in contrast to the Guoy-Chapman
double layer on interfaces with significant $\zeta$-potentials, dominates the
low-frequency dynamics and produces dielectric enhancement.
