Magnetic Field

PHYSICSStudio

A magnetic dipole field-line visualizer: drag the poles around and watch the field re-thread itself in real time.

UpdatedMar 2026

ExportsPNG, JPG

Runs onAny browser

PriceFree

Overview

A dynamic physics playground.

Magnetic Field renders the field of one or more magnetic dipoles. Each field line is traced forward and backward from a starting point on a small circle around a pole, giving you the classic looping pattern of a bar magnet.

Drag the poles anywhere, add more dipoles, or change the field-line count to see how the pattern reacts.

Features

Built for physics-scale experimentation.

01 / Spotlight

Field lines traced

Forward and backward from poles; supports one or more dipoles.

Drag poles to

Reposition; add or remove dipoles from the sidebar.

Adjustable field-line count

Integration step, and trail fade; export PNG or JPG.

How to use

Workflow

Steps take about a minute.

Drag the poles to reposition them. Use the sidebar to add or remove dipoles, change the field-line count, and adjust the integration step. Reset clears the trails; Export PNG/JPG saves a frame.

Use cases

What people use it for

Visualizing magnetic dipole field lines for physics teachingDemonstrating magnetostatics and how field lines formCreating electromagnetic visuals for presentations or contentExploring multi-dipole field interactions interactively

FAQ

Common questions

Are these real field lines?+

They're integrated from the analytic dipole field, so yes — each line is the true integral curve of the dipole field, including the loops that emerge from a real bar magnet.

Why do some lines end mid-air?+

Field lines should close on themselves, but the integrator can drift if the step size is too large. Lower the integration step in the sidebar for cleaner closed curves.