Is embedding the Coulomb's law simulator free?

Yes. It is free to embed on any site, with no account, no API key and no usage limits. The whole simulation runs in your visitor’s own browser, so there is no server cost — we only ask that you keep the small "Coulomb's Law Simulator by LK Forge" credit line that comes with the embed code.

What can visitors do with the embedded simulator?

They set each of two point charges in microcoulombs (positive or negative) and the separation between them, and watch the force update. The tool draws equal and opposite force arrows on the two charges — pointing together when they attract and apart when they repel — with a live panel showing the force magnitude, whether it is attractive or repulsive, the separation and Coulomb's constant.

Does the embed show the inverse-square law?

Yes. The force is computed directly as F = k·|q₁·q₂|/r², so sliding the separation makes the force fall off with the square of the distance — double the gap and the force drops to a quarter. It is a quick, visual way to build intuition for why electrostatic forces weaken so rapidly with distance.

What iframe height should I use, especially on mobile?

The snippet ships with height="780", which is tall enough that the two charges, the three sliders and the readouts all fit without clipping even on a narrow phone where everything stacks into a single column. On a wider page the widget simply centres within its max-width of 560px. If you want it shorter you can lower the height, but 780 is the safe default across screen sizes.

Where can I embed it — WordPress, Wix, Squarespace, Notion?

Anywhere you can add HTML, because it is a standard iframe. In WordPress use a Custom HTML block; in Squarespace a Code/Embed block; in Wix an Embed HTML element; in Ghost an HTML card; in Notion paste the /embed/coulombs-law/ URL as an embed. On a plain HTML page or an intranet, paste the snippet straight into the markup.

Does the embedded simulator track visitors or set cookies?

No. Everything runs locally in the visitor’s browser — nothing is uploaded. The embed sets no tracking cookies and sends no analytics, so it is safe to place on a privacy-sensitive site, an intranet, or a page for students.

Widgets

How to Add a Coulomb's Law Simulator to Your Website

LK Forge · 4 min read · Updated September 2026

You can add a full Coulomb's law simulator to any website, blog, or classroom page with a single line of code — free, with no sign-up, no plugin, and no script to install. Visitors set two charges and see the force between them. This guide covers the fastest way to embed the Coulomb's Law Simulator, what it teaches, and where it works.

The quickest way: paste one embed snippet

An embed is just an <iframe> that loads the simulator from lkforge.com, plus a small credit line. Copy this into your page’s HTML where you want the widget to appear:

<iframe src="https://lkforge.com/embed/coulombs-law/"
        width="100%" height="780" loading="lazy"
        style="border:0;max-width:560px"
        title="Coulomb's Law Simulator by LK Forge"></iframe>
<p><a href="https://lkforge.com/tools/physics/coulombs-law/">Coulomb's Law Simulator</a>
   by <a href="https://lkforge.com/">LK Forge</a></p>

The <iframe> is the live simulator; the <p> underneath is a plain credit link. Keep that line — the visible link is what keeps the widget free to embed. You can also copy this exact code straight from the LK Forge widget gallery.

What the widget shows

The simulator opens with an attracting pair, so a visitor sees the force immediately and can then change it:

Two charges: set each from −10 to +10 µC — the signs decide attract or repel.
Separation: slide the charges apart and watch the inverse-square fall-off.
Equal and opposite arrows: the force on each charge, as Newton's third law demands.
Live readouts: force magnitude, nature (attractive/repulsive), separation and Coulomb's constant.

Pick the right height

The snippet uses height="780", which fits the charges, the sliders and the readouts without clipping even on a narrow phone, where they stack into one column. On a wider page the widget centres within its max-width:560px. That single height works across screen sizes, so there is nothing to tweak for mobile.

Where it works

Because it is a standard iframe, the embed works anywhere you can add HTML:

WordPress: add a Custom HTML block and paste the snippet.
Squarespace: use a Code / Embed block.
Wix: add an Embed HTML / iframe element.
Ghost: insert an HTML card.
Notion: paste the /embed/coulombs-law/ URL and choose "Create embed".
Plain HTML, an intranet, or a lesson page: paste the snippet straight into the markup.

That’s the whole job. Copy the embed code from the widget gallery and paste it wherever a lesson or a blog post on Coulomb's law, electrostatics or the inverse-square law needs charges students can actually push and pull.

Grab the embed code from the LK Forge widget gallery — free, no sign-up.

Open the Coulomb's Law Simulator

Frequently asked questions

Is embedding the Coulomb's law simulator free?: Yes. It is free to embed on any site, with no account, no API key and no usage limits. The whole simulation runs in your visitor’s own browser, so there is no server cost — we only ask that you keep the small "Coulomb's Law Simulator by LK Forge" credit line that comes with the embed code.
What can visitors do with the embedded simulator?: They set each of two point charges in microcoulombs (positive or negative) and the separation between them, and watch the force update. The tool draws equal and opposite force arrows on the two charges — pointing together when they attract and apart when they repel — with a live panel showing the force magnitude, whether it is attractive or repulsive, the separation and Coulomb's constant.
Does the embed show the inverse-square law?: Yes. The force is computed directly as F = k·|q₁·q₂|/r², so sliding the separation makes the force fall off with the square of the distance — double the gap and the force drops to a quarter. It is a quick, visual way to build intuition for why electrostatic forces weaken so rapidly with distance.
What iframe height should I use, especially on mobile?: The snippet ships with height="780", which is tall enough that the two charges, the three sliders and the readouts all fit without clipping even on a narrow phone where everything stacks into a single column. On a wider page the widget simply centres within its max-width of 560px. If you want it shorter you can lower the height, but 780 is the safe default across screen sizes.
Where can I embed it — WordPress, Wix, Squarespace, Notion?: Anywhere you can add HTML, because it is a standard iframe. In WordPress use a Custom HTML block; in Squarespace a Code/Embed block; in Wix an Embed HTML element; in Ghost an HTML card; in Notion paste the /embed/coulombs-law/ URL as an embed. On a plain HTML page or an intranet, paste the snippet straight into the markup.
Does the embedded simulator track visitors or set cookies?: No. Everything runs locally in the visitor’s browser — nothing is uploaded. The embed sets no tracking cookies and sends no analytics, so it is safe to place on a privacy-sensitive site, an intranet, or a page for students.