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Electromagnetic Field Theory

Electromagnetic Field Theory
The ability of charged bodies to exert force on one another is attributed to the existence of

 electrons.
 neutrons.
 electric field.
 protons.

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Electromagnetic Field Theory
For a line characteristic impedance zo terminated is load zo/3, the reflection coefficient is

 – 1/3.
 1/3.
  – ½.
 2/3.

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Electromagnetic Field Theory
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

The weight of the conductor
The value of current
None of these
The direction of the conductor

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Electromagnetic Field Theory
Which of following can induce the maximum induced voltage ?

 1 amp 1 Hz.
 1 amp dc.
 1 amp 100 Hz.
 20 amp dc.

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Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 24t.
 4t3.
 12t.
 12t3.

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Electromagnetic Field Theory
An electric dipole of moment P is placed in front of a ground sphere. The change induced on the surface of the sphere is (Assume radius of sphere = R and distance from dipole to centre of sphere = d)

 Zero.
 PR/d.
 PR/d2.
 PR 2/d3.

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