Electricity · Physics

Coulomb's Law Simulation

Two charges push or pull. Change their sizes, signs and separation and watch F = kq₁q₂/r² — the same inverse-square form as gravity, but able to repel.

Interactive virtual lab · no download · works on phones and laptops

Chapter: Electric Charges and Fields
For: Class 12 · JEE · NEET
Time: ~8 min

Coulomb's Law is a Pro simulation

Pro opens all 125 virtual labs — 483 simulations with guides and quizzes.

How to use it

1Drag the charges to change the distance.
2Set each charge with its slider (negative to positive).
3Switch between the macro scale (μC, cm) and the atomic scale (e, pm).

What to notice

Like charges repel, unlike charges attract.
The force falls as 1/r²: half the distance → four times the force.
Both charges feel equal and opposite forces.
k = 8.99 × 10⁹ N m²/C² — electric forces dwarf gravity.

For teachers

A ready-made teaching kit comes with this lab

Lesson plan
18 min, 4 steps
Ask the class
3 questions with answers
Quick quiz
6 questions, printable
Key formulas
2 formulas

Unlock with Pro

About the Coulomb's Law simulation

Coulomb's law gives the force between two point charges: proportional to the product of the charges and inversely proportional to the square of the distance between them. Like charges repel and unlike charges attract, and the forces on the two charges are always equal and opposite.

In this Coulomb's law simulation you set two charges in microcoulombs, drag them apart along a ruler, and read the force arrows and their values. It covers Electric Charges and Fields in Class 12, JEE and NEET.

Also covers: electrostatic force, point charges, inverse square law, attraction repulsion.