A closed magnetic-source ledger keeps force, flux change, and induced voltage visible instead of hiding them inside a single answer. The listed 24 N, 12 Wb, and 4 V values are exact only for the declared ideal field, current, length, area, and timing assumptions; real magnetic systems add nonuniform fields, leakage flux, winding resistance, saturation, motion and alignment error, losses, heating, and force/flux/voltage measurement uncertainty.
The final lesson keeps magnetic sources visible instead of hiding an audit. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Each magnetic claim keeps its own checked source
The force source is 24 newtons, the flux change is 12 webers, and the induced voltage is 4 volts.
24N,12Wb,4V
The final source ledgers stay readable
Transformer power is 12 watts, and generator energy is 60 joules. The lesson shows sources instead of an opaque audit.