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Electromagnetic Field Theory

Electromagnetic Field Theory
Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is

 2.
 1.
 4.
 0.5.

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Electromagnetic Field Theory
Fleming's right hand rule may be applied to an electric generator to find out the direction of

 magnetic field.
 induced emf.
None of these
 rotor rotation.

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Electromagnetic Field Theory
The property of the coil by which a counter emf is induced in it when the current through the coil changes is known as

 mutual inductance.
 self inductance.
 capacitance.
 series aiding inductance.

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Electromagnetic Field Theory
If the resistance of a conductor does not vary in accordance with the Ohms law it is known as

 non - conductor.
 reverse conductor.
 bad conductor.
 non - linear conductor.

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Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 Ey = Ez = 0, By = Bz = 0.
 Ex = Ey = 0, By = Bz = 0.
 Ex = Ey = 0, Bx = By = 0.
 None of these.

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

None
An isolator
An attenuator
Phase shifter

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