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Electromagnetic Field Theory

Electromagnetic Field Theory
If E is the electric field intensity, then what is the value of divergence of (curl of E)?

 Null vector.
 E.
 Zero.
 | E |.

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Electromagnetic Field Theory
In an iron core coil the iron core is removed so that the coil becomes an air core coil. The inductance of the coil will

 initially increase and then decrease.
 decrease.
 increase.
 remain the same.

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Electromagnetic Field Theory
The static electric field in a conductor is

Infinity
Unity
None of these
Zero

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

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Electromagnetic Field Theory
Parabolic and lens antenna used at

High frequency
Microwave frequency
Low frequency
Medium frequency

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Electromagnetic Field Theory
Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charge will

 remain in stable equilibrium.
 be in unstable equilibrium.
 will move out of the field of influence of two charges.
 not be equilibrium.

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MORE MCQ ON Electromagnetic Field Theory

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