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Electromagnetic Field Theory

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

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

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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.
 0.447.
 0.477.
 0.01.

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Electromagnetic Field Theory
The magnitude of force acting on a current carrying conductor placed in a magnetic field is independent of

 flux density.
 current flowing through the conductor.
 cross-sectional area of conductor.
 length of conductor.

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Electromagnetic Field Theory
Plane z = 10 m carries charge 20 C/m2. The electric field intensity at the origin is

  – 360 πuz v/m.
 – 18 πuz v/m.
 – 10 uz v/m.
 – 72 πuz v/m.

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

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

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Electromagnetic Field Theory
A conductor of length 1 metre moves at right angles to magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced emf in the conductor will be

 50 V.
 25 V.
 75 V.
 100 V.

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