Magnetic Compass & Field Sources

Compass needle aligns with total B  ·  Left-click: place source  ·  Right-click: remove  ·  Drag: move
Wire: B=µ₀I/2πr  |  Loop: B=µ₀NIR²/2(R²+d²)^(3/2)  |  Solenoid: B≈µ₀nI/2·R²/(R²+d²)
B_earth: 20.0 µT @ 0.0°N
B_total: —
Needle: 0.0° (N)
Sources: 0
x: 0.0 cm   y: 0.0 cm
matimatix
Earth's Field
Magnitude20.0 µT
Direction (° from North)0°
Add Field Source
⊙ Wire
◎ Loop
▭ Solenoid
Current I (A)5.0
Direction
⊙ Out of page
⊗ Into page
Current I (A)5.0
Turns N10
Radius R (cm)5.0
Current direction
→ Toward compass
← Away from compass
Current I (A)5.0
Turns N (total)100
Radius R (cm)3.0
Length L (cm)20
Current direction
→ Toward compass
← Away from compass
Display
Sources & B at Compass
No sources placed yet. Earth's horizontal B field points North by default. Place a source on the canvas to deflect the needle.