Presets
Point Charge · Positive
field radiates outward
Point Charge · Negative
field converges inward
Electric Dipole
+ and − pair
Like Charges · Repelling
two positives
Charge Quadrupole
4 charges, alternating
Linear Quadrupole
+ − + in a row
Parallel Plate Capacitor
uniform field inside
Charged Ring
null field at centre
Point Charge · Positive
Field lines
12
Field vector grid
Animate flow
Colour by strength
Cursor compass
Sources
+ Positive
− Negative
× Clear all
Charges:
—
Field lines:
—
—
Drag
a charge — reposition it
Click
a charge — flip its sign
Right-click
— remove a charge
Hover
empty space — compass shows field direction