Electric Field in Two Dimensions
In this simulation, you can explore the concept of the electric field,
in a two-dimensional situation. You can turn on 1 to 5 charged
particles, and move a test charge around the plane near these charged
particles to sample the electric field, produced by the charged
particles, at various points. You can also turn on a grid of field
vectors, which show the direction and, qualitatively, the magnitude of
the field at a grid of equally spaced points in the plane in which the
charged particles are located.
Here are some facts about the electric field from point charges:
the magnitude of the electric field (E) produced by a point charge
with a charge of magnitude Q, at a point a distance r away from the
point charge, is given by the equation E = kQ/r2, where k
is a constant with a value of 8.99 x 109 N m2/C2.
the direction of the electric field produced by a point charge is away
from the charge if the charge is positive, and toward the charge if
the charge is negative.
electric field is a vector, so when there are multiple point charges
present, the net electric field at any point is the vector sum of the
electric fields due to the individual charges.