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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
The critical frequency of ‘F’ layer is greater than 30 MHz.

True
False

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Electromagnetic Field Theory
A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Orbiting satellite
Passive satellite
Geostationary satellite
Active satellite

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Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 18.08 A.
 9.04 A.
 2.28 A.
 4.56 A.

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

 Zero.
 E.
 | E |.
 Null vector.

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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

 8 A/m.
 4 A/m.
 1 A/m.
 2 A/m.

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