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JEE Main 201912 JanuaryEvening Shift
Exam
JEE Main
Year
2019
Date
12 January
Shift
Evening Shift
Subject
Physics
Chapter
Electromagnetic Waves

JEE Main 2019 · 12 January · Evening Shift · Physics · Electromagnetic Waves

The mean intensity of radiation on the surface of the Sun is about...

The mean intensity of radiation on the surface of the Sun is about 108W/m2.{10}^{8}W / {m}^{2} . The rms value of the corresponding magnetic field is closest to:

Options

  1. A1T1T
  2. B10−2T{10}^{- 2}T
  3. C102T{10}^{2}T
  4. D10−4T{10}^{- 4}T

Correct answer

D. 10−4T{10}^{- 4}T

Step-by-step solution

I=B022μ0×CI = {B}_{0}^{2}2{\mu}_{0} \times C

B0=2μ0IC{B}_{0} = \sqrt{\dfrac{2{\mu}_{0}I}{C}}

Brms=μ0IC=4π×10−7×1083×108{B}_{rms} = \sqrt{\dfrac{{\mu}_{0}I}{C}} = \sqrt{\dfrac{4\pi \times {10}^{- 7} \times {10}^{8}}{3 \times {10}^{8}}}

≈10−4T\approx {10}^{- 4}T
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