Mean intensity of radiation on surface of Sun is about 10^{8},W/m^2. rms value of corresponding magn

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8.Electromagnetic waves

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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 closet to

A

$1\,T$

B

$10^2\,T$

C

$10^{-2}\,T$

D

$10^{-4}\,T$

(JEE MAIN-2019)

Solution

$\mathrm{I}=\frac{\mathrm{B}_{\mathrm{o}}^{2}}{2 \mu_{\mathrm{o}}} \times \mathrm{C}$

$B_{0}^{2}=1 \times 2 \mu_{0} \times C$

$B_{0}^{2}=\frac{10^{3} \times 2 \times 4 \pi \times 10^{-7}}{3 \times 10^{8}}$

$B_{0} \approx 10^{-4} \,T$

Standard 12

Physics

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