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Electromagnetic Field Theory

Electromagnetic Field Theory
The radiation pattern of a parabola antenna is

Omnidirectional
Highly directional
A figure of directional
None of these

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Electromagnetic Field Theory
A rectangular loop in the x – z plane bounded by the lines x = 0, x = a, z = 0 and z = b is in a time varying magnetic field is given by B = B0 cosωt + ay. Where B0 is constant, ω is angular frequency and ay unit vector in the y direction. Now the emf induced in the loop is given by

 ab Bo cosω t.
 Zero.
 Bo ω sinω t.
  abω Bo sinω t.

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Electromagnetic Field Theory
________ at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.

 Magnetic flux density.
 Electric intensity.
 Electric flux.
None of these

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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

 1800 V.
 200 V.
 900 V.
 0 V.

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Electromagnetic Field Theory
The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

 q(E + V × B).
 q(H + V × E).
 q(E +V × H).
 q(E + B × V).

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Electromagnetic Field Theory
A conductor of length L has current I passing through it, when it is placed parallel to strong magnetic field. The force experienced by the conductor will be

 BL2I.
 zero.
 BIL.
 BI2L.

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