Drift in a Field - Physics for Biophysics Step by Step

A field can move charged fragments through a channel, but this book uses dimensionless training indices for the transport law. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

A field index drives a mobility index

This training model uses dimensionless mobility and field indices, not a real gel mobility unit.

\text{training indices only}

The speed index is exact

Mobility index 1 times field index 2 gives speed index 2.

v_{\text{index}}=\mu E=2

Distance follows speed times time

After time 3 seconds, the band has moved 6 meters.

x=v_{\text{index}}t=6\ \text{m}