ECE · all questions

Electromagnetic Field Theory
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Q241

If the magnitude of

H

in a plane wave is 1 A/m, what is the magnitude of

E

for a plane wave in free space:

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Q242

The time averaged Poynting vector, in W/m², for a wave with

E = 24 e^{j (ω t + B z)} a_{y} V/m

in free space

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Q243

In a medium if ε, µ, and σ are constant through out the medium, then it is known as:

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Q244

If φ = 2x²y - xz³, then the Laplacian of φ is

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Q245

The loss-less, quarter wavelength long, RF transmission of characteristic impedance 50 Ω is terminated in pure resistive load impedance 100 Ω, the input impedance is:

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Q246

A loss-less 50 ohm transmission line is terminated in (A) 25 ohm and (B) 100 ohm loads. Which one of the following statements would be correct, if the voltage standing wave patterns measured in the two cases are compared?

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Q247

The main components of atmosphere responsible for absorption of electromagnetic waves are

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Q248

The region between two concentric cylinder with radii of 2 and 5 cm contains a volume charge distribution of -10^-8(1 + 10r) C/m³. If E_r and V both are zero at the inner cylinder and ε = ε₀, the potential V at the outer cylinder will be:

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Q249

Find the gradient of the curve y = 3x² -7x + 2 at the point (1, -2):

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Q250

The characteristic impedance of a transmission line with inductance 0.294 µH/m and capacitance 60 pF/m, is

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Q251

An electromagnetic wave is transmitted into a conducting medium of conductivity ?. The depth of penetration is

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Q252

What is the effect of the earth's magnetic field in the reflected wave at frequencies in the vicinity of gyro-frequency?

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Q253

For free space E = 50 cos(10⁸t + βx), then the value of β . . . . . . . .

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Q254

The value of flux linkage is 6t³ at time t = 2 seconds. What is the emf of a material?

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Q255

The depth of penetration of electromagnetic wave in a medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be

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Q256

In a transmission line with ωL >> R and ωC >> G, Phase Shift constant β is proportional to

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Q257

In electromagnetic waves, polarisation is

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Q258

The line impedance at voltage minimum is

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Q259

For a plane wave propagating in an unbounded medium (say, free space), the minimum angle between electric field and magnetic field vectors is

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Q260

An infinitely long uniform charge of density 30 nC/m is located at y = 3, z = 5. The field intensity at (0, 6, 1) is E = 64.7a_y - 86.3a_z V/m. What is the field intensity at (5, 6, 1)?

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