A dialog box will open asking for further information on the charge's x and y coordinates and the magnitude of the charge. The magnitude of a charge can be expressed in either elementary charges or Coulombs. An elementary charge is a charge with the magnitude of and electron. Remember, elementary charge are much smaller a Coulomb in magnitude. If charges on the order of magnitude of elementary charge and charges on the order of magnitude of Coulombs are mixed in the same plane, the charges on the order of magnitude of Coulombs will vastly out power the smaller charges.
Positive charges are red, negative charges are blue.
The charge should now disappear. Then position the mouse over a point through which the field line should pass. An electric field line should appear though this point. Position the mouse over a point on the plane through which the equipotential line should pass. An electric equal potential line should appear though this point.