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Electromagnetic Field Theory

Electromagnetic Field Theory
The ability of charged bodies to exert force on one another is attributed to the existence of

 neutrons.
 protons.
 electric field.
 electrons.

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Electromagnetic Field Theory
The radiation pattern of loop antenna is

Semicircle
Elliptical
Circle
Cardoid or Limacon

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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

 0 V.
 200 V.
 900 V.
 1800 V.

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Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its

 overload capacity.
 short time rating.
 cooling.
 rating.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Loss coefficient
Transmission efficiency
None of these
Front to back ratio

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Electromagnetic Field Theory
The divergence of a vector is a scalar, while the curl of a vector is another

Unit vector
Vector
Scalar
None of these

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MORE MCQ ON Electromagnetic Field Theory

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