NEET Physics EM Waves NEET PYQ-EM Waves

  • question_answer
    The velocity of electromagnetic wave is along the direction of:                                [AIPMT 2002]

    A)  \[\vec{B}\times \vec{E}\]

    B)                   \[\vec{E}\times \vec{B}\]

    C)  \[\vec{E}\]       

    D)                   \[\vec{B}\]

    Correct Answer: B

    Solution :

    An electromagnetic wave is the wave composed of the oscillations of electric and magnetic fields in mutually perpendicular planes and these oscillations are perpendicular to the direction of propagation of wave.
    The direction of propagation of electromagnetic wave is given by poynting vector
    \[\vec{S}=\vec{E}\times \vec{H}=\frac{\vec{E}\times \vec{B}}{{{\mu }_{0}}}\]
    This is parallel to \[\vec{E}\times \vec{B}\]

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