Electromagnetic Field Theory - Study Mode
[#126] Blue colour of sky look due to
Correct Answer
(C) Scattering
[#127] A vector [overrightarrow P ] is given by [overrightarrow P = {x^3}y{overrightarrow a _x} - {x^2}{y^2}{overrightarrow a _y} - {x^2}yz{overrightarrow a _z}] Which of the following statements is TRUE?
Correct Answer
(A) [overrightarrow P ] is solenoidal, but not irrotational
[#128] The intensity of radiation of a dipole depends strongly on frequency. If at a frequency f, the intensity of radiation is '$$I$$' then at a frequency of $$frac{{ ext{f}}}{2}$$, the intensity will be:
Correct Answer
(B) $$frac{{ ext{I}}}{4}$$
[#129] A lossy transmission line has resistance per unit length-R = 0.01 Ω/m. The line is distortion less and has characteristic impedance of 100 Ω. The attenuation constant (in NP/m, correct to three decimal places) of the line is
Correct Answer
(A) 0.0001
[#130] A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m. If the line is distortion less, the attenuation constant (in Np/m) is
Correct Answer
(D) 0.002