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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Div grad V.
 Div curl A.
 Grad div A.
 Curl curl A.

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Electromagnetic Field Theory
Magnetic field intensity at centre of circular coil, of diameter 1 m and carrying a current of 2 A is

 1 A/m.
 8 A/m.
 4 A/m.
 2 A/m.

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Electromagnetic Field Theory
Ohm’s law in point from field theory can be expressed as

 R = ρ × ( l / A).
 V = IR.
 J = E / σ.
 J = σE.

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Electromagnetic Field Theory
MUF is depend upon

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

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Electromagnetic Field Theory
A coil of 300 turns is wound on a non magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The inductance of the coil corresponding to a magnetizing current of 6 A will be

 3.768 μH.
 1.1304 μH.
 37.68 μH.
  113.04 μH.

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Electromagnetic Field Theory
The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

 q(E + V × B).
 q(E +V × H).
 q(E + B × V).
 q(H + V × E).

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