Q121
Open questionConsider a solid sphere of radius 5 cm made of a perfect electric conductor. If one million electrons are added to this sphere, these electrons will be distributed:
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Electromagnetic Field Theory
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Q122
Open questionThe divergence of magnetic flux density is
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Q123
Open questionA lossless transmission line is 100 cm long operate at 400 MHz. The line parameters are L = 0.49 µH/M and C = 100 pf. Find the phase constant and phase velocity.
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Q124
Open questionGiven a range of frequencies, which of the following system is best for transmission line load matching?
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Q125
Open questionThe dominant mode in a waveguide is characterized by
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Q126
Open questionElectric displacement current density D at any point on a spherical surface of radius r centred at the isolated charge q is:
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Q127
Open questionDue to polarization.
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Q128
Open questionMagnetic flux can be measured by:
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Q129
Open questionA theorem that relates surface integral with the volume integral is called
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Q130
Open questionWhen a load resistance RL is connected to a lossless transmission line of characteristic impedance 75 Ω. It results in a VSWR of 2. The load resistance is
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Q131
Open questionIn a charge-free space, the Poisson's equation results in which of the following?
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Q132
Open questionA TEM wave is incident normally upon a perfect conductor. The E and H fields at the boundary will be, respectively,
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Q133
Open questionTwo identical copper wires W1 and W2 placed in parallel as shown in the figure, carry currents I and 2I, respectively, in opposite directions. If the two wires are separated by a distance of 4r, then the magnitude of the magnetic field between the wires at a distance r from W1 is
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Q134
Open questionWhen a dielectric is placed in an electric field, the electric flux density D, electric field intensity E and polarization P are related as
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Q135
Open questionGilbert is a unit of
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Q136
Open questionIf is a constant vector and then div and curl are given by
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Q137
Open questionA material is described by the following electrical parameters at a frequency of 10 GHz σ = 106 mho/m, µ = µ0 and ∈/∈0 = 10. The martial at this frequency is considered to be
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Q138
Open questionFor a perfect matched load the value of standing wave ratio and reflection coefficient respectively are
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Q139
Open questionLaplace equation in cylindrical coordinates is given by:
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Q140
Open questionA measure of the mismatch between the maximum and minimum voltage and current variation along the transmission line is called SWR, i.e. standing wave ratio. SWR indicates how much power is delivered to the load, and how much is lost in the line. When SWR is 1, the percent reflected power is zero. When SWR is 1.5, the percent reflected power will be
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