Measurement Instruments
Drag onto canvas (multiple allowed):
V
Voltmeter
E Field
Ruler
Marker
Instructions
Drag charges from the panel onto the canvas.
Red = positive,
Blue = negative
Drag charges on canvas to reposition.
Field lines flow from + to −
Tip: right-click (or long-press on iPad) any charge or instrument to delete it.
Add Charges
Drag onto canvas:
+
+1 nC
−
−1 nC
Scale: 1 pixel ≈ 1 cm
At 10 cm from 1 nC: V ≈ 90 V