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[Electric Fields]
Electric Field

When an object is placed in a region near
a charged body, the object experiences a
force. We call this region an electric field.

We can show electric fields by lines with
arrows.

We can show electric fields by lines with
arrows.
Electric field lines

The direction of an electric field is given
by the direction in which a positive charge
would move when placed in the field.
positive charge
positive charge
positive charge

By definition,
 positive charge -- point outward
 negative charge -- point inward
Electric Field patterns
Electric Field patterns
(+ & - )
Electric Field patterns
(+ & - )
Electric field line rules

The field lines start at positive charges
and end at negative charges
 Field lines do not have branches and do
not cross each other
 When the field is uniform (its strength and
direction are constant), the lines are
parallel.
 The density of field lines represent the
strength of the electric field