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Electromagnetic Field Theory

Electromagnetic Field Theory
Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V.

 5.25m.
 6.25m.
 0.5m.
 0.6m.

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

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

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Electromagnetic Field Theory
The Kirchhoff’s current law is implict in expression

  Surface integral of (j.ds) = 0.
 Curl of H = J + (δ D)/(δ t).
 Divergence of D = ρv.
 Divergence of B = 0.

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Electromagnetic Field Theory
Materials subjected to rapid reversals of magnetism should have

 low permeability.
 low hysteresis loss.
 both a and b.
 high permeability.

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Electromagnetic Field Theory
What is the value of total electric flux coming out of a closed surface?

 Equal to volume change density.
 Equal to total charge enclosed by the surface.
 Zero.
 Equal to the surface charge density.

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

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

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