The mean intensity of radiation on the surface of the Sun is about 107 wattm-2. The r.m.s value of corresponding magnetic field approximately is

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10-2

102

10-4

105

answer is D.

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Detailed Solution

mean Intensity is I = (Brms)22μ0CBrms=2I μ0C =2 × 107 × 4π × 10-7 × 3 × 108 =24π × 108≈105

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