Physics

Problem

At a distance of

10\,\text{cm}

on its axial line, a magnetic dipole produces a field magnitude of

240\,\text{nT}

. Approximately how far from the dipole along the same line must a sensor be placed so that it measures a field magnitude of

50\,\text{nT}

? a)

22\,\text{cm}

48\,\text{cm}

17\,\text{cm}

13\,\text{cm}