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Electromagnetic Field Theory

Electromagnetic Field Theory
The Biot-savarts law is a general modification of

 Kirchhoffs law.
 Lenzs law.
 Amperes law.
 Faradays law.

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

 1/3.
  – ½.
 – 1/3.
 2/3.

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

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

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Electromagnetic Field Theory
In an inductor current cannot change abruptly. Comment on the statement.

 False.
 True.
 True partially.
 Cannot comment.

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Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Horizontal suspended wire type
Parabolic reflector type
Vertical grounded wire type
Any of the above

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Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

  10 mH.
 0 mH.
 5 mH.
 20 mH.

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