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2.1Debye Shielding In most types of plasma, quasi-neutrality is not just an ideal equilibrium state; it is a state that the plasma actively tries to achieve by readjusting the local charge distribution in response to a disturbance.However, it is more useful to consider the shielding as a dielectric phenomenon: i.e., it is the polarization of the plasma medium, and the associated redistribution of space charge, which prevents penetration by an external electric field.

2.1Debye Shielding
In most types of plasma, quasi-neutrality is not just an ideal equilibrium
state; it is a state that the plasma actively tries to achieve by readjusting the
local charge distribution in response to a disturbance. Consider a
hypothetical experiment in which a positively charged ball is immersed in
plasma; see Figure below. After some time, the ions in the ball’s vicinity will
be repelled and the electrons will be attracted, leading to an altered average
charge density in this region. It turns out that we can calculate the potential
φ(r) of this ball after such a readjustment has taken place.
Plasmas generally do not contain strong electric fields in their rest frames. viewed as a result of high plasma conductivity: i.e., plasma current
generally flows freely enough to short out interior electric fields. However,
it is more useful to consider the shielding as a dielectric phenomenon: i.e.,
it is the polarization of the plasma medium, and the associated
redistribution of space charge, which prevents penetration by an external
electric field.