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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.
 Zero.
 | E |.
 E.

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Electromagnetic Field Theory
Electric field strength of charge

 Increase distance.
 Increase square distance.
 Decrease with distance.
 Decrease with square distance.

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Electromagnetic Field Theory
Two straight parallel conductors carry equal currents in opposite direction. The force between them is

 repulsive.
 zero.
 none of above.
 attractive.

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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.

 9.04 A.
 2.28 A.
 18.08 A.
 4.56 A.

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Electromagnetic Field Theory
Which of the following represents ohms law

 I = GV
 V = RI
All of these
 J = σE

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Electromagnetic Field Theory
The emf induced in a conductor rotating in bipolar field is

 AC.
 DC and AC both.
 DC.
 none of these.

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