Q281
Open questionThe displacement current can be represented as
Select an option to see the answer and solution.
ECE · all questionsElectromagnetic Field Theory
Electromagnetic Field Theory
practice.
Practice every MCQ with options. Use Show answers when you want the correct option and solution.
329
Questions
15/17
Page
Pick an option on a question to see the right answer and solution.
Q282
Open questionWhat is the value of the magnetic vector potential due to an infinitesimally small current element, evaluated at infinite distance from it?
Select an option to see the answer and solution.
Q283
Open questionA steel pipe is constructed of a material for which µr = 200 and σ = 5 × 106 mho/m. The outer and inner radii are 8 and 6 mm respectively and the length is 80 m. If the total current carried by the pipe is 2cos104πt A,Then the skin depth will be
Select an option to see the answer and solution.
Q284
Open questionIf the short circuit and open circuit impedance of a line are 5 Ω and 20 Ω respectively the characteristic impedance is given by
Select an option to see the answer and solution.
Q285
Open questionThe characteristic impedance of a co-axial cable depends on diameter of
Select an option to see the answer and solution.
Q286
Open questionIn general attenuation per unit length in a coaxial cable:
Select an option to see the answer and solution.
Q287
Open questionWhat would be the standing wave ratio (SWR) for a line with reflection coefficient equal to 0.49?
Select an option to see the answer and solution.
Q288
Open questionWhen a plane electromagnetic wave is incident normally on the boundary between two lossless dielectric media, the transmission coefficient for magnetic field intensity is
Select an option to see the answer and solution.
Q289
Open questionThe potential at the centroid of an equilateral triangle of side due to three equal positive point charges each of value q and placed at the vertices of the triangle would be:
Select an option to see the answer and solution.
Q290
Open questionConsider the following statements:
For a 10 m long common power line connecting a switch to a light bulb
1. It is distributed circuit
2. Time delay for propagation through it is negligible
3. It is in the form of a shielded coaxial cable of circular cross-section
4. As the intensity of the lamp varies, input impedance of this line also changes
Which of the above statements is/are correct?
For a 10 m long common power line connecting a switch to a light bulb
1. It is distributed circuit
2. Time delay for propagation through it is negligible
3. It is in the form of a shielded coaxial cable of circular cross-section
4. As the intensity of the lamp varies, input impedance of this line also changes
Which of the above statements is/are correct?
Select an option to see the answer and solution.
Q291
Open questionMaxwell's equation for EM waves can be applied to
1. Dielectric medium
2. Conductive medium
3. Plasma
4. Free space
Select the correct choice:
1. Dielectric medium
2. Conductive medium
3. Plasma
4. Free space
Select the correct choice:
Select an option to see the answer and solution.
Q292
Open questionWhat does the expression represent?
Select an option to see the answer and solution.
Q293
Open questionIf the potential difference between points A (1, 0, 0) and B (2, 0, 0) is 10 V, determine d for point C (d, 0, 0), when VBC is 6 V in a uniform field.
Select an option to see the answer and solution.
Q294
Open questionFollowing equations represent four travelling waves. Which one has the maximum speed?
Select an option to see the answer and solution.
Q295
Open questionA and B are two points at same distance from the centre of a short electric dipole on axial line and equatorial line respectively. E1 and E2 are respectively the resultant electric fields due to the dipole at these points. Identify the only correct condition between E1 and E2 from the following for this situation.
Select an option to see the answer and solution.
Q296
Open questionWhat is not correct about a transmission line terminated in its characteristic impedance?
Select an option to see the answer and solution.
Q297
Open questionFind the work done when a force acting on a particle takes it from the point to the point
Select an option to see the answer and solution.
Q298
Open questionA transmission line is distortionless if
Select an option to see the answer and solution.
Q299
Open questionThe intrinsic impedance η of a conducting medium for which σ = 58 Ms/m, µr = 1 at a frequency of 100 MHz is
Select an option to see the answer and solution.
Q300
Open questionA charge Q2 = 8.854 × 10-9 C is located in a vacuum at P2 (2, 3, 1). The force on Q2 due to a charge Q1 = 4π × 10-3 C at P1 (2, 2, 1) is:
(Note : All the coordinates are measured in Meters. ax, ay and az are unit vectors in X, Y and Z direction respectively.)
(Note : All the coordinates are measured in Meters. ax, ay and az are unit vectors in X, Y and Z direction respectively.)
Select an option to see the answer and solution.