Electromagnetic Field Theory - Study Mode
[#66] If $$overrightarrow E = left( {{{hat a}_x} + j{{hat a}_y}}
ight){e^{ikz - jomega t}}$$ xa0 xa0and $$overrightarrow H = left( {frac{k}{{omega mu }}}
ight)left( {{{hat a}_y} + j{{hat a}_x}}
ight){e^{ikz - jomega t}},$$ xa0 xa0 xa0 the time averaged poynting vector is
Correct Answer
(A) null vector
[#67] For distortion less transmission through a channel, the channel should be such that
Correct Answer
(B) its attenuation response is flat and phase response is linear with frequency
[#68] An electromagnetic wave propagates through a lossless insulator with a velocity 1.5 × 10 10 cm/s. Calculate the electric and magnetic properties of the insulator if its intrinsic impedance is 90 π ohms.
Correct Answer
(A) ε r = 2.66 µ r = 1.5
[#69] For a lossless transmission line L = 0.35 µH/m. C = 90 pF/m and frequency = 500 MHz. Then the magnitude of propagation constant is:
Correct Answer
(B) 17.63
[#70] The gradient of the function f(x, y) = x + y at the point (0, 0) is
Correct Answer
(B) i + j