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Electromagnetic Field Theory

Electromagnetic Field Theory
Poyniting vector has the dimensions

 Watt × metre.
 Watt/metre.
 Watt × metre2.
 Watts/metre2.

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Electromagnetic Field Theory
Skin depth is proportional to

 Permeability.
 Frequency.
 √(σ).
 1/√σ.

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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.
 4.56 A.
 18.08 A.
 2.28 A.

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Electromagnetic Field Theory
The hysteresis loop of a magnetic material has an area of 5 cm2 with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is

  25 W.
 50 W.
 20 W.
 15 W.

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

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

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Electromagnetic Field Theory
An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10-8 C. Potential developed will be

 200 V.
 1800 V.
 900 V.
 0 V.

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