Magnetic field measured by a tablet magnetometer depends linearly on the coil current¶

Claim · All claims
Evidence · 1 study · causal r1 · q2
Currency · newest study 2014 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 2017: tool and model accuracy changes quickly

Subclaims¶

q2 i? In the coil experiment, measured magnetic field B fits a linear function of current I, with slope a = (41.0247± 0.2571)µT/A. → V.O.M. Lara 2014

Evidence¶

V.O.M. Lara 2014¶

V.O.M. Lara, D. F. Amaral, D. Faria, and L. P. Vieira. (2014). Demonstrations of magnetic phenomena: Measuring the air permeablity using tablets. https://arxiv.org/abs/1405.6581 doi:10.48550/arxiv.1405.6581

q2 · i? · the article prints no effect size for this finding · causal · r1

A demonstration-set experiment in which current was increased by equal amounts δI = 0.05 A at fixed axial distance z = 4.8 cm, with B recorded by the iPad app and fitted with Gnuplot; the linear fit gave "a = (41.0247± 0.2571)µT/A".

"The data adjust was realized using the‘fit’ command from the Gnuplot[8], with B(I) =aI +b, a = (41.0247± 0.2571)µT/A and b = (0.611347± 0.143)µT ."

Discussion¶

Related Claims¶

• Magnetic field falls off as the inverse cube of axial distance for both a coil and a magnet — related
• The demonstration set yields a fair estimate of air permeability µair from coil data — related
• The magnet data cannot determine air permeability; only the magnet's dipole moment can be estimated — related