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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.
 electric field.
 protons.
 electrons.

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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
Dust particles may not accumulate
None of these
Charge per unit area becomes very high for lightening to discharge

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Electromagnetic Field Theory
In free space E (z, t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z, t)

 (103/377) sin(ωt - β z)(-ux) A/m.
 (103/377) cos(ωt - β z)(-ux) A/m.
 (103/377) sin(ωt - β z)(ux) A/m.
 None of above.

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Electromagnetic Field Theory
A square corner reflector is used in

Tv broadcast
All of these
Radio astronomy
Point to point communication

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Electromagnetic Field Theory
A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is

 none of these.
 40π coulombs.
 80π coulombs.
 10π coulombs.

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Electromagnetic Field Theory
A dipole having a moment p – 3ux - 5uy + 10uz ncm is located at p(1,2,-4) in free space. The V as Q(2,3,4) is

 2.52 V.
 2.62 V.
 1.31 V.
 1.26 V.

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