This happens until, in the static
situation, the two fields cancel each other and the
net electrostatic field in the conductor is zero In a
dielectric, this free movement of charges is not
possible It turns out that the external field induces
dipole moment by stretching or re-orienting
molecules of the dielectric The collective effect of all
the molecular dipole moments is net charges on the
surface of the dielectric which produce a field that
opposes the external field