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Electromagnetic Field Theory

Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 7640 N.
 764 N.
 76400 N.
 76.4 N.

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Electromagnetic Field Theory
Tropospheric scatter is used with frequencies in the

VHF
UHF
HF
VLF

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Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

 48 mH.
 24 mH.
 12 mH.
 3 mH.

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Electromagnetic Field Theory
Coulombs law for the force between electric charges most closely resembles with

 Law of conservation of energy.
 Gauss theorem.
 Newtons law of motion.
 Newtons law of gravitation.

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Electromagnetic Field Theory
Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is

 1.
 2.
 4.
 0.5.

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Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

 20 mH.
 5 mH.
 0 mH.
  10 mH.

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