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In a uniform field,
with the same value of field intensity at all points, the difference in
potential between two points in the field, situated in the direction
of the field is determined as follows :V1 -V2 = E· d where E is the value
of the field intensity and d the distance between the points.
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For this same reason it
is normal to express field intensity in volts/ m, that is a
measure of the variation of the potential with the distance, as well as
in N/C.
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A charged particle which
penetrates a uniform field at some speed moves within it with a
parabolic movement, similar to that of a bullet in the earth's
gravitational field.
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