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Charged Parallel Plates

There are several properties of oppositely charged parallel plates that are worth noting.

F net is the same everywhere This animation helps illustrate that no matter where a charge is placed between to oppositely charged parallel plates, the net force is the same. Notice that the sum of the force from the top plate and the force from the bottom plate always equals the same amount.
field lines and equipotential lines (3k) This image shows what the electric field lines and the equipotential lines look like for two oppositely charged parallel plates.  Notice that the field lines are evenly spaced (except at the very ends).  This implies that the electric field strength is the same anywhere between the plates.
Field intensity between 2 plates formula The field strength for the field between to equal but oppositely charged parallel plates can be calculated by the formula shown to the left.  d represents the separation between the plates while V represents the potential difference placed across the plates.  The breakdown of the units is not obvious.   It is difficult to see how N/C could be the same thing as volts/meter.  How   volts/meter becomes a N/C is shown below
Getting from Volts/m to N/C
Change in d distance between plates According to the field intensity formula, the smaller you make the distance between the plates, the stronger the electric field becomes if the potential difference is held constant.