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Electromagnetic Field Theory

Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

 48 mH.
 12 mH.
 24 mH.
 3 mH.

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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.
 2/3.
  – ½.

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Electromagnetic Field Theory
Skin depth is proportional to

 Frequency.
 √(σ).
 Permeability.
 1/√σ.

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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

 12t.
 24t.
 12t3.
 4t3.

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Electromagnetic Field Theory
Which of this statement is not characteristic of a static magnetic field

 it has no sink or sources.
 it is solenoidal.
 it is conservative.
 magnetic flux lines are always closed.

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Electromagnetic Field Theory
A medium is said to be isotropic when

 ∈ = μσ.
 ∈ is a scalar constant.
 ∈ = μ.
 ∈ is zero.

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