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diff --git a/emratio.tex b/emratio.tex index 4a45931..42d6630 100644 --- a/emratio.tex +++ b/emratio.tex @@ -235,7 +235,13 @@ $\sigma_m$}. \section*{Appendix: Helmholtz coils} -The term Helmholtz coils refers to a device for producing a region of nearly uniform magnetic field. It is named in honor of the German physicist Hermann von Helmholtz. A Helmholtz pair consists of two identical coils with electrical current running in the same direction that are placed symmetrically along a common axis, and separated by a distance equal to the radius of the coil $a$. The magnetic field in the central region may be calculated using the Bio-Savart law: +The term Helmholtz coils refers to a device for producing a region of +nearly uniform magnetic field. It is named in honor of the German physicist +Hermann von Helmholtz. A Helmholtz pair consists of two identical coils +with electrical current running in the same direction that are placed +symmetrically along a common axis, and separated by a distance equal to +the radius of the coil $a$. The magnetic field in the central region may be +calculated using the Biot-Savart law: \begin{equation}\label{emeq_apx} B_0=\frac{\mu_0Ia^2}{(a^2+(a/2)^2)^{3/2}}, \end{equation} |