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Electromagnetic Field Theory

Electromagnetic Field Theory
A pure inductor is connected across a voltage source. Find the active power drawn by the inductor?

 maximum
None of these
 0
 either 1 or 2

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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

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

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Electromagnetic Field Theory
The potential that appears at a point in space due to the current which caused it is called potential

Lagging the current
Retardation
Accelerating
Oscillating

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Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Grad div A.
 Curl curl A.
 Div curl A.
 Div grad V.

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Electromagnetic Field Theory
A circular ring is carrying uniformly distributed charge q and a point charge – Q on the axis of the ring. The magnitude of dipole moment of the charge system is (Assume distance between centre of ring and point charge is d and radius of ring R)

 QR2/d.
 Q√(R2 + d2).
  QD.
 QR.

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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.
 0 mH.
 5 mH.
  10 mH.

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