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Electromagnetic Field Theory

Electromagnetic Field Theory
How much current must flow in a loop of radius 1m to produce a magnetic field of 1 mA/m?

 2 mA.
 2.5 mA.
 1.5 mA.
 1mA.

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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) sin(ωt - β z)(-ux) A/m.
 None of above.
 (103/377) cos(ωt - β z)(-ux) A/m.

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

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

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Electromagnetic Field Theory
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

Rain drops may not collect
Charge per unit area becomes very high for lightening to discharge
Dust particles may not accumulate
None of these

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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.
 225.
 250.
 150.

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Electromagnetic Field Theory
A waveguide operated below cut off frequency can be used as

An isolator
None
An attenuator
Phase shifter

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