Coulomb's law and superposition

Two point charges in vacuum, water or glass. See the force vectors, electric field lines, the inverse-square law on a live F–r graph, and the effect of the medium.

About this experiment

What you do in the lab

Change the controls and watch the physics behave in real time in 3D. Live readouts and graphs show the numbers behind it, and the Learn tab has the theory, procedure, observations and viva questions. Works on a phone or a laptop, in English and Hindi.

Topics: Coulomb · electric field · field lines · inverse square

More from this chapter

• Electric field on the axis of a ring and a disc
• Electric dipole in uniform field: torque
• Electric field lines and dipole field
• Gauss's law: flux through closed surfaces
• Field and potential of a charged shell and a solid sphere
• Charging by friction, induction, conduction (electroscope)