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Electromagnetic Field Theory

Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = 0.
 Divergence of B = J.
  Divergence of B = 0.
 Curl of B = J.

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Electromagnetic Field Theory
The magnetic field at any point on the axis of current carrying circular coil will be

 zero.
 at an angle 45o with the axis.
 parallel to axis.
 perpendicular to axis.

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Electromagnetic Field Theory
A conductor of length 100 cm moves at right angles to a magnetic field of flux density 1.5 Wb/m2 with a velocity of 50 m/s. The induced emf in the conductor will be

 37.5 V.
 75 V.
 50 V.
 150 V.

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Electromagnetic Field Theory
Fleming's right hand rule may be applied to an electric generator to find out the direction of

 induced emf.
 rotor rotation.
 magnetic field.
None of these

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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
If in a 1 mF capacitor, an instantaneous displacement current of 1 A is to be established in the spaces between its plates then it is possible by applying

 106 Amp/sec.
 106 Amp.
 106 volts.
 106 volts/sec.

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