Magnetic flux counts how much perpendicular magnetic field passes through an area, so this training case multiplies field strength by area. The 3 tesla by 2 square meter ledger is exact only for a uniform perpendicular field; real flux measurements depend on angle, field variation, probe calibration, area uncertainty, and fringe effects.
A perpendicular field-area ledger gives magnetic flux. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Perpendicular field times area sets flux
A field of 3 tesla through area 2 square meters gives flux 6 webers.
Φ=3×2=6Wb
This is only the perpendicular training case
The clean area ledger is 3 times 2, with no angle factor.