Flux Bench
M81
· iron filings field
source
DIPOLE PAIR
SINGLE POLE
WIRE (INTO PLATE)
QUADRUPOLE
strength
density
⌁ FIELD LINES
◐ FLUX HEAT
⇣ SHAKE PLATE
filings
0
· B̄
0
· poles
2
every steel grain is a compass needle easing into the local field of the sources · DRAG the red/blue poles across the plate · switch source geometry to see monopole, wire and quadrupole patterns