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Electromagnetic Field Theory

Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 12t3.
 24t.
 12t.
 4t3.

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Electromagnetic Field Theory
In above problem the induced emf will be reduced to half if the conductor moves an angle of

  60° to the direction of field.
  75° to the direction of field.
  45° to the direction of field.
  30° to the direction of field.

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

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

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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
A pure inductor when connected across 220 V, 50 Hz supply consumes 100 W. From the above statement it can be concluded that

 the above statement is false.
 the inductor is made of thin wire.
 the inductor has ferrite core.
 the inductor is non linear.

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Electromagnetic Field Theory
A rectangular loop in the x – z plane bounded by the lines x = 0, x = a, z = 0 and z = b is in a time varying magnetic field is given by B = B0 cosωt + ay. Where B0 is constant, ω is angular frequency and ay unit vector in the y direction. Now the emf induced in the loop is given by

 Zero.
 Bo ω sinω t.
  abω Bo sinω t.
 ab Bo cosω t.

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