91. If \[\overrightarrow F \left( {\rho ,\,\phi ,\,z} \right) = \rho {{\hat a}_\rho } + \rho {\sin ^2}\phi {{\hat a}_\phi } - z{{\hat a}_z}\] which one of the following is TRUE?
92. Short circuited stubs are preferred to open-circuited stubs because the latter are
93. Two metal rings 1 and 2 are placed in a uniform magnetic field which is decreasing with time their planes perpendicular to the field. If the rings are identical except that ring 2 has a thin air gap in it, which one of the following statement is correct?
94. If over the course of a day, the maximum electron density in the ionosphere varies from 1011 to 1012 m-3; the critical frequency changes approximately from:
95. An electric charge of Q coulombs is located at the origin. Consider electric potential V and electric field intensity E at any point (x, y, z). Then
96. In the infinite plane y = 6m, there exists a uniform surface charge density of $$\frac{1}{{6000\pi }}\mu {\text{C/}}{{\text{m}}^2}$$ the associated electric field strength is
97. A plane wave having x-directed electric field propagating in free space along the z-direction is incident on an infinite electrically conducting (perfect conductor) sheet at z = 0 plane. Which one of the following is correct?
98. The capacitance per unit length and the characteristic impedance of a lossless transmission line are C and Z0 respectively. The velocity of a travelling wave on the transmission line is
99. An infinite plane Z = 10 m carries a uniformly distributed charge of density 2n C/m2. The electric field intensity at the origin is
100. An elliptically polarized wave travelling in the positive Z-direction in air has x and y components
Ex = 3sin(ωt - βz) V/m
Ey = 6sin(ωt - βz + 75°) V/m
Ex = 3sin(ωt - βz) V/m Ey = 6sin(ωt - βz + 75°) V/m
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