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Electromagnetic Field Theory

Electromagnetic Field Theory
The main disadvantage of the two-hole directional coupler is

High standing wave ratio
Narrow bandwidth
Poor directivity
Low directional coupling

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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.
 0.5 J.
 0.015 J.
 0.15 J.

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Electromagnetic Field Theory
Which of the following represents ohms law

 V = RI
 J = σE
 I = GV
All of these

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Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 764 N.
 76400 N.
 76.4 N.
 7640 N.

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Electromagnetic Field Theory
MUF is depend upon

Received frequency by receiver
Height of ionospheric layer
11 year sun spot cycle
Electron density of the ionospheric layer

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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

 0.447.
 0.01.
 0.477.
 0.577.

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MORE MCQ ON Electromagnetic Field Theory

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