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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following is multiband HF receiving antenna?

Log-periodic
Square loop
Conical horn
Folded dipole

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

 10 C.
 40π C.
 None of above.
 5 C.

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Electromagnetic Field Theory
What is the unit of magnetic charge

 Ampere.
 Ampere-meter square.
 Coulomb.
  Ampere meter.

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Electromagnetic Field Theory
How much current must flow in a loop of radius 1m to produce a magnetic field of 1 mA/m?

 1.5 mA.
 2.5 mA.
 1mA.
 2 mA.

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Electromagnetic Field Theory
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.

No
Yes

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Electromagnetic Field Theory
A sphere of 20 cm radius contains electrical charge of density 2/(r sinθ) c/m3. What is the total charge contained within the sphere?

 0.335/sinθ c.
 None of above.
 0.335 C.
 0.

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