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Electromagnetic Field Theory

Electromagnetic Field Theory
Which antenna is a wideband antenna?

Marconi antenna
Folded dipole
Hertz antenna
None of these

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Electromagnetic Field Theory
1 Tesla =

 1 wb .
 1 wb- m2.
 1 wb/m.
 1 wb/ m2.

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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = cosφ Ir - sinφ Ir.
 A = cosφ Ir + sinφ Iφ.
 A = cosφ Ir.
 A = sinφ Ir.

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Electromagnetic Field Theory
A magnetic circuit requires 800 AT to produce a certain quantity of flux in a magnetic circuit. If its excitation coil has 100 turns and 5 Ohm resistance, the voltage to be applied in exciting coil is

 80 V.
 60 V.
 8 V.
 40 V.

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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

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

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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

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

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MORE MCQ ON Electromagnetic Field Theory

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