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ELECTROMAGNETIC FIELD THEORY

Electromagnetic Field Theory
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere

 Qr/(4 π εo R3).
 QR/(4π εo r3).
 3 Qr/(4 π εo R3).
 Q/(4 π εo r3).

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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
In frec space E (z,t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z,t)

 None of above.
 (103/377) cos(ωt - β z)(-ux) A/m.
 (103/377) sin(ωt - β z)(-uy) A/m.
  (103/377) sin(ωt - β z)(-ux) A/m.

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Electromagnetic Field Theory
Magnetic flux density emerging out of a closed surface is

 zero.
 depends on magnetic movements inside the closed surface.
 infinite.
 depends on magnetic movements outside the closed surface

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Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Grad div A.
 Div curl A.
 Div grad V.
 Curl curl A.

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