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

None of these
Loss coefficient
Transmission efficiency
Front to back ratio

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Electromagnetic Field Theory
A wire carrying current is bent in the form of a circular loop. Then the magnetic field around each portion of the wire will be

 parallel to half portion and perpendicular for the other half.
 parallel to the plane of the wire.
 none of above.
 perpendicular to the circumference of the wire.

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