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KVPY Sample Paper KVPY Stream-SX Model Paper-6

  • question_answer
    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) \[{{10}^{-4}}\,T\]

    Correct Answer: D

    Solution :

    \[I=\frac{B_{o}^{2}}{2{{\mu }_{o}}}\times C\] \[B_{o}^{2}=I\times 2{{\mu }_{o}}\times C\] \[B_{o}^{2}=\frac{{{10}^{3}}\times 2\times 4\pi \times {{10}^{-7}}}{3\times {{10}^{8}}}\] \[{{B}_{0}}\approx {{10}^{-4}}T.\]


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