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Electromagnetic Field Theory

Electromagnetic Field Theory
The Biot-savarts law is a general modification of

 Kirchhoffs law.
 Faradays law.
 Amperes law.
 Lenzs law.

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Electromagnetic Field Theory
Cork Screw rule is used to find

 direction of current.
 direction of emf.
 direction of electric field.
 direction of magnetic field.

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Electromagnetic Field Theory
A fan blade of length 2R rotates in a time period T in a magnetic field B. The induced voltage in the blade is proportional to

 R2B / T.
 R2BT.
 RBT.
 2RBT.

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Electromagnetic Field Theory
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is

 0.577.
 0.477.
 0.01.
 0.447.

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Electromagnetic Field Theory
The lagging of flux density behind the applied magnetising force is known as

 permeance.
 flux.
All of these
 hysteresis.

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Electromagnetic Field Theory
A coil of 300 turns is wound on a non magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The inductance of the coil corresponding to a magnetizing current of 6 A will be

 3.768 μH.
 37.68 μH.
 1.1304 μH.
  113.04 μH.

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