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NEET NEET SOLVED PAPER 2018

  • question_answer
    An em wave is propagating in a medium with a velocity\[\overrightarrow{\text{v}}=\text{v}\widehat{\text{i}}\]. The instantaneous oscillating electric field of this em wave is along \[\text{+y}\] axis. Then the direction of oscillating magnetic field of the em wave will be along [NEET - 2018]

    A)  -y direction                

    B)  +z direction

    C)  -z direction                 

    D)  -x direction

    Correct Answer: B

    Solution :

    \[\overrightarrow{\text{E}}\times \overrightarrow{\text{B}}=\overrightarrow{\text{V}}\] \[(\text{E}\overrightarrow{\text{j}})\times (\overrightarrow{\text{B}})=\text{v}\widehat{\text{i}}\] So, \[\overrightarrow{\text{B}}\text{=B}\widehat{\text{k}}\] Direction of propagation is along +z direction.


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