NEET Physics EM Waves NEET PYQ-EM Waves

  • question_answer
    The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic  wave  propagating  in vacuum is equal to                                                                                                          [AIPMT (M) 2012]

    A)  the speed of light in vacuum

    B)  reciprocal of speed of light in vacuum

    C)  the ratio of magnetic permeability to the electric susceptibility of vacuum

    D)  unity

    Correct Answer: B

    Solution :

    As         \[E=cB\]
    So required ratio \[\frac{E}{B}=c\]
                \[\frac{B}{E}=\frac{1}{c}\]
    Therefore, the ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to reciprocal of speed of light.


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