JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank EM Waves

  • question_answer
    In an electromagnetic wave, the electric and magnetising fields are \[100\,V\,{{m}^{-1}}\] and \[0.265\,A\,{{m}^{-1}}\]. The maximum energy flow is                                  [Pb. PMT 1997, 98]

    A)            \[26.5\,W/{{m}^{2}}\]      

    B)            \[36.5\,W/{{m}^{2}}\]

    C)            \[46.7\,W/{{m}^{2}}\]      

    D)            \[765\,W/{{m}^{2}}\]

    Correct Answer: A

    Solution :

                       Here \[{{E}_{0}}=100\ V/m,\]\[{{B}_{0}}=0.265\ A/m.\] \ Maximum rate of energy flow S = \[{{E}_{0}}\times {{B}_{0}}\]            = \[100\times .265=26.5\frac{W}{{{m}^{2}}}\]          


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