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JEE Main & Advanced Physics EM Waves Question Bank Self Evaluation Test - Electromagnetic Waves

  • question_answer
    The average electric field of electromagnetic waves in certain region of free space is\[9\times {{10}^{-4}}N{{C}^{-1}}\]. Then the average magnetic field in the same region is of the order of

    A) \[27\times {{10}^{-4}}T\]

    B) \[3\times {{10}^{-12}}T\]

    C) \[\left( \frac{1}{3} \right)\times {{10}^{-12}}T\]

    D) \[3\times {{10}^{-12}}T\]

    Correct Answer: B

    Solution :

    [b] For electromagnetic waves we know that, \[\frac{E}{B}=c\]         \[\therefore \,\,\,\,\frac{9\times {{10}^{-4}}}{B}=3\times {{10}^{8}}\,m{{s}^{-1}}\] \[\Rightarrow \,\,B=3\times {{10}^{-12}}T.\]


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