86. Let the z= 0 plane in rectangular coordinate system has uniform surface charge distribution
of p, Coulombs/m’. The permittivity of the medium is ¢ and 2 is the unit vector along z

direction. Then the flux density at any point z units away from the plane is:

‎ச ரூ 42‏ مہ
& )0 ~ ©
2 2

‎87. Which of the following statements about the field quantities at the interface two different
media is not correct?

‎(A) with finite surface current, the normal component of magnetic field is
discontinuous through the interface

‎(B) with finite surface charge, the normal component of electric field is discontinuous
through the interface

‎(C) with finite surface current, the tangential component of magnetic field is
discontinuous through the interface

‎(D) with finite value of magnetic flux, the tangential component of electric field is
continuous through the interface

‎88. Which one of the following represents the equation for the E-field of linearly polarized
uniform plane wave propagating in the x-direction?

‎(¢) = = &0 ८०8 (८४ - 6 १) >
2
az”

‎0522,
‎9”
‎( E=E,[cos(at- fx) 3 +sin(wt— ‏مھ‎ 2]

‎

‎(0)

‎

‎

‎= /८€

‎ट ೫೫
7) ore ye 2
சிக

‎89. For the far field, H, of electromagnetic wave, radiated from a current element, which of the
following is not correct?

‎(^) Lis inversely proportional to the square of the distance from the element
(B) Lis proportional to current through the element
(C) Lis inversely proportional to current through the element

‎(D) Lis directly proportional to frequency of the wave

‎231/2023 16 A