# 法拉第效应

## 數學表述

${\displaystyle \beta ={\mathcal {V}}Bd}$

## 星際物質造成的法拉第旋轉

${\displaystyle \beta =\mathrm {R} \lambda ^{2}}$

${\displaystyle \mathrm {R} ={\frac {e^{3}}{2\pi m^{2}c^{4}}}\int _{0}^{d}n_{e}(s)B_{||}(s)\;\mathrm {d} s}$

${\displaystyle \mathrm {R} ={\frac {e^{3}}{8\pi ^{2}\epsilon _{0}m^{2}c^{3}}}\int _{0}^{d}n_{e}(s)B_{||}(s)\;\mathrm {d} s=2.62\times 10^{-13}\int _{0}^{d}n_{e}(s)B_{||}(s)\;\mathrm {d} s}$

## 參考文獻

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