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Electromagnetic Field Theory

Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = 0.
  Divergence of B = 0.
 Divergence of B = J.
 Curl of B = J.

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Electromagnetic Field Theory
What is the value of skin depth as 100 Hz in a material having μr = 1.0 and & σ = 3.60 × 107 s/m

 2.4 mm.
 8.4 mm.
 4 mm.
 10 mm.

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Electromagnetic Field Theory
1 Maxwell is the same as

 10-8 weber.
 104 weber.
 10-8 weber.
 10-4 weber.

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Electromagnetic Field Theory
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is

 0.577.
 0.01.
 0.447.
 0.477.

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Electromagnetic Field Theory
Two coils have inductances L1 = 1200 mH and L2 = 800 mH. They are connected in such a way that flux in the two coils aid each other and inductance is measured to be 2500 mH, then Mutual inductance between the coils is ___________ mH.

 145.
 150.
 225.
 250.

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Electromagnetic Field Theory
Between a hollow and solid metal sphere, charge reside

 on outer surface in both.
 on outer surface in hollow and throughout in solid.
 on outer surface in hollow and throughout in solid
 None of above.

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