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Home Electronics and Communication Engineering Electromagnetic Field Theory Comments

  • Question
  • Which one of the following potential does not satisfy Laplace's equations?


  • Options
  • A. v = 10 xy
  • B. v = p cos ?
  • C. Which one of the following potential does not satisfy Laplace's equations? v = 10 xy v = p cos ? v =
  • D. v = f cos ? + 10

  • Correct Answer
  • v = p cos ? 

    Explanation
    Which one of the following potential does not satisfy Laplace's equations? v = 10 xy v = p cos ? v =.

    Electromagnetic Field Theory problems


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    • 1. The phase angle corresponding to ?/4 in a standing-wave pattern is

    • Options
    • A. 30°
    • B. 90°
    • C. 135°
    • D. 180°
    • Discuss
    • 2. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ? = 80 ?0. The surface charge density on the conductor is ((?0 = 10-9/36p)F/m)

    • Options
    • A. 0 c/m2
    • B. 2 c/m2
    • C. 1.8 x 10-11 c/m2
    • D. 1.14 x 10-9 c/m2
    • Discuss
    • 3. The electric field of the incident wave is , where ? = 3 x 109p and ? = 10 p. The electric field of the transmitted wave Et is given by

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 4. A (75 - j 40) W load is connected to a co-axial line of z0 = 75? at 6 MHz. The load matching on the line can be accomplished by connecting

    • Options
    • A. a short circuit stub at the load
    • B. an inductance at the load
    • C. a short circuit stub at a specific distance from the load
    • D. a capacitance at a specific distance from the load
    • Discuss
    • 5. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.

    • Options
    • A. 4 cm
    • B. 1 cm
    • C. 2 cm
    • D. 8 cm
    • Discuss
    • 6. Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is

    • Options
    • A.
    • B.
    • C.
    • D. 20p2
    • Discuss
    • 7. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be

    • Options
    • A. 4 mW
    • B. 1 mW
    • C. 7 mW
    • D. 1/4 mW
    • Discuss
    • 8. Find the radiation resistance of an antenna of length ?/10 meter?

    • Options
    • A. 8 ?
    • B. 780 ?
    • C. 7.8 ?
    • D. 78 ?
    • Discuss
    • 9. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is

    • Options
    • A. 10 watts
    • B. 1 watt
    • C. 0.1 watt
    • D. 0.01 watt
    • Discuss
    • 10. The radiation resistance of a ?/16 wire dipole in free space will be nearly

    • Options
    • A. 1 ?
    • B. 3 ?
    • C. 13 ?
    • D. 30 ?
    • Discuss


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