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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following represents ohms law

 J = σE
 V = RI
 I = GV
All of these

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Electromagnetic Field Theory
The radiation pattern of loop antenna is

Semicircle
Cardoid or Limacon
Circle
Elliptical

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Electromagnetic Field Theory
Two point charges (Q and – Q) are situated at the vertex of the square. If potential at another vertex is 2 V, so potential at opposite vertex (diagonally) is

 Zero.
  2 V.
 √ 2 V.
 1 V.

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Electromagnetic Field Theory
The field at any point on the axis of a current carrying coil will be

 zero.
 at angle of 45° with the axis.
 parallel to axis.
 perpendicular to the axis.

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Electromagnetic Field Theory
The energy stored in the magnetic field at a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying an current at 10 A, is

 1.15 J.
 0.15 J.
 0.5 J.
 0.015 J.

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Electromagnetic Field Theory
The critical frequency of ‘F’ layer is greater than 30 MHz.

False
True

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MORE MCQ ON Electromagnetic Field Theory

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