Magnetic Field Lines

Visualise magnetic fields from bar magnets

Show Field Lines

Show Arrows

Show Vector Field

Show Labels

Show Grid

Snap to Grid

Grid: 50

Lines: 20

Components & Instruments

Bar Magnet

Compass

B Probe

Wire Out of Page

Wire Into Page

Marker

Ruler

Hall Probe

Presets

Bar Magnets

Current-Carrying Wires

Solenoids

Wire View Mode

Horizontal wires

Add wires and a marker, then open diagram to see B-field analysis at point P.

Field Info

Magnets: 0

Wires: 0

Field lines: 0

Force on Wire (F = BIL)

Show Force

L = 0.10 m

B_ext at wire × I × L. Use B probe to measure field, predict force, then check.

Fields

Magnetic field (B)

B: 50 mT

Electric field (E)

E: 250 kV/m

Selected velocity: —

v = E/B (undeflected path)

Drag field region to move/resize

Particle

Presets

q: +1 e

m: 1 u

v: 5.0 ×10⁵ m/s

Click gun to fire. Drag barrel to aim.

Forces

Show F_B (magnetic)

Show F_E (electric)

Show Velocity (v)

Scrub:

0%

Show force values

Show velocity value

Instruments

Ruler

Zoomed View

3D View — drag to rotate

Side View — Field at Point P