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

  • question_answer
    For plane electromagnetic waves propagating in the z-direction, which one of the following combination gives the correct possible direction for \[\vec{E}\] and \[\vec{B}\] field respectively?

    A) \[(2\hat{i}+3\hat{j})\] and \[(\hat{i}+2\hat{j})\]

    B) \[(-2\hat{i}-3\hat{j})\] and \[(3\hat{i}-2\hat{j})\]

    C) \[(3\hat{i}+4\hat{j})\] and \[(4\hat{i}-3\hat{j})\]

    D) \[(\hat{i}+2\hat{j})\] and \[(2\hat{i}-\hat{j})\]

    Correct Answer: B

    Solution :

    [b] As we know, \[\vec{E}.\vec{B}=0\]       \[\because \,\,[\vec{E}\bot \vec{B}]\] and\[\vec{E}\times \vec{B}\] should be along Z direction As \[(-2\hat{i}-3\hat{j})\times (3\hat{i}-2\hat{j})=5\hat{k}\] Hence option is the correct answer.


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