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It's not that though. The iron filing change the magnetic field making it denser where the filing are. So they self organize into reenforcing channels of flux.
by tlarkworthy 9y ago
It's not that though. The iron filing change the magnetic field making it denser where the filing are. So they self organize into reenforcing channels of flux. So it's not a true visualization of the field, because the field is changed by the measurements.
- noobermin 9y agoUseless pedantic then, it is not a "true visualization" of the B field in free space absent the filings. It is however, an approximate visualization of it.