question_answer 20)

    The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is (a) c: 1                                   (b) c2: 1                           (c) 1 : 1                                  (d)      

Answer:

                                   (c)Intensity of em wave,   In terms of electric field, In terms of magnetic field, Now (electric field due to magnetic field Thus the energy in em wave is divided equally between electric field vector and magnetic field vector. Therefore, the ratio of contributions by the electric field and magnetic field components to the intensity of an em wave is 1:1.