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The mean intensity of radiation on the surface of the Sun is about $10^8$ W/m$^2$. The rms value of the corresponding magnetic field is closest to:
(1) $1$ T
(2) $10^2$ T
(3) $10^{-2}$ T
(4) $10^{-4}$ T
$B_{\text{rms}} = \sqrt{\frac{I\mu_0}{c}} \approx 10^{-2}$ T.
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