NEET Physics EM Waves NEET PYQ-EM Waves

  • question_answer
    In an electromagnetic wave in free space the root mean square value of the electric field is \[{{E}_{rms}}=6\,V/m\]. The peak value of the magnetic field is                                                                                            [NEET-2017]

    A)  \[4.23\times {{10}^{-8}}T\]                 

    B)  \[1.41\times {{10}^{-8}}T\]

    C)  \[2.83\times {{10}^{-8}}T\]

    D)  \[0.70\times {{10}^{-8}}T\]

    Correct Answer: C

    Solution :

    [c] \[\frac{{{E}_{rms}}}{{{B}_{rms}}}=c\]
    \[=\frac{6}{3\times {{10}^{8}}}\]
    \[{{B}_{rms}}=2\times {{10}^{-8}}\]
    \[{{B}_{0}}=\sqrt{2}\times {{B}_{rms}}\]
    \[=\sqrt{2}\times 2\times {{10}^{-8}}\]
    \[=2.83\times {{10}^{-8}}T\]

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