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Question

The mean intensity of radiation on the surface of the Sun is about 108 Wm2. The rms value of the corresponding magnetic field is closest to:

A
102 T
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B
1 T
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C
102 T
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D
104 T
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Solution

The correct option is D 104 T
The intensity of the electromagnetic wave is given by,

I=B202μ0c
(B02)2=Iμ0c
Brms=Iμ0c
Brms=108×4π×1073×108
Which is closest to 104.

Hence, option (D) is correct.

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