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Electromagnetic Field Theory
As a result of reflection from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called the
velocity of propagation.
normal velocity.
group velocity.
phase velocity.
velocity of propagation.
normal velocity.
group velocity.
phase velocity.
Answer
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Related Question
Electromagnetic Field Theory
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
Rain drops may not collect
Charge per unit area becomes very high for lightening to discharge
None of these
Dust particles may not accumulate
Rain drops may not collect
Charge per unit area becomes very high for lightening to discharge
None of these
Dust particles may not accumulate
Answer
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Electromagnetic Field Theory
Which is the major factor for determining whether a medium is free space, lossless dielectric or a good conductor
Reflector coefficient.
Constitutive parameters.
Attenuation constant.
Loss tangent.
Reflector coefficient.
Constitutive parameters.
Attenuation constant.
Loss tangent.
Answer
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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as
A = cosφ Ir + sinφ Iφ.
A = cosφ Ir.
A = cosφ Ir - sinφ Ir.
A = sinφ Ir.
A = cosφ Ir + sinφ Iφ.
A = cosφ Ir.
A = cosφ Ir - sinφ Ir.
A = sinφ Ir.
Answer
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Electromagnetic Field Theory
The radiation pattern of a parabola antenna is
None of these
Omnidirectional
A figure of directional
Highly directional
None of these
Omnidirectional
A figure of directional
Highly directional
Answer
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Electromagnetic Field Theory
The Kirchhoff’s current law is implict in expression
Curl of H = J + (δ D)/(δ t).
Divergence of B = 0.
Surface integral of (j.ds) = 0.
Divergence of D = ρv.
Curl of H = J + (δ D)/(δ t).
Divergence of B = 0.
Surface integral of (j.ds) = 0.
Divergence of D = ρv.
Answer
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