question_answer 23)

    An electromagnetic wave travelling along z-axis is given as :  Choose the correct options from the following; (a) The associated magnetic field is given as  (b) The electromagnetic field can be written in terms of the associated magnetic field as (c) (d)

Answer:

  (a,b,c)Suppose an em wave is travelling along negative -direction. Its electric field is given by which is perpendicular to z-axis. It acts along negative y-direction. The associated magnetic field in em wave is As                                     Thus, option (c) is correct. The associated electric field can be written in terms of magnetic field as . Thus, option (b) is correct. Angle between  and  is 90° and between and is 90°. Therefore 90°=0 and  90°= 0. Thus, option (c) is correct