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Electromagnetic Field Theory

Electromagnetic Field Theory
Ohm’s law in point from field theory can be expressed as

 J = E / σ.
 J = σE.
 V = IR.
 R = ρ × ( l / A).

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Electromagnetic Field Theory
In a lossless medium the intrinsic impedance η = 60π and μr = 1. The relative dielectric constant εr shall be

 4.
 1.
 2.
 8.

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Electromagnetic Field Theory
A potential field is given by V = 3x2 y – yz. The electric field at P(2, -1, 4) is

 12 Ix - 8 Iy - Iz V/m.
 12 Ix - 8 Iy V/m.
 12 Ix + 8 Iy + Iz V/m.
 12 Ix - Iz V/m.

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Electromagnetic Field Theory
For a linear electromagnetic circuit, which of the following statement is true?

 Field energy is lesser than the co-energy.
 Co-energy is zero.
 Field energy is equal to the co-energy.
 Field energy is greater than the co-energy.

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Electromagnetic Field Theory
________ at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.

None of these
 Electric intensity.
 Magnetic flux density.
 Electric flux.

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Electromagnetic Field Theory
The frequency range for satellite communication is

3000 to 30000 MHz
3 to 30 kHz
300 to 3000 kHz
30000 to 300000 MHz

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