An electric field is a region where a charge feels a force, and its direction at any point is the way the force pushes a positive test charge. Choose a charge arrangement, drag the small positive test charge around, and watch the force arrow line up with the field. A marked point appears each round: predict the direction on the test charge there, then place it to check. Switch on the field lines to see the whole pattern.
MissionPredict the force direction on a positive test charge at point P.Round 1Streak 0Best 0
Charges:
Force on + points:
Tip: drag the small positive test charge to feel the field anywhere.
arrangementsingle positive charge
force on + test chargedrag to explore
field strength herelow
point P resultnot placed yet
The field direction is the force on a positive charge. Lines leave + charges and enter - charges, crowding where the field is strong.