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Electromagnetic Field Theory

Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Retentivity.
 Hysteresis.
 Coercivity.
 Saturation magnetism.

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

Folded dipole
Conical horn
Log-periodic
Square loop

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Electromagnetic Field Theory
Poyniting vector has the dimensions

 Watt × metre.
 Watt × metre2.
 Watts/metre2.
 Watt/metre.

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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.
 QR.
  QD.
 Q√(R2 + d2).

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Electromagnetic Field Theory
A point pole has a strength of 4π × 10-4 weber. The force in newtons on a point pole of 4π × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be

 3.75 N.
 7.5 N.
 20 N.
 15 N.

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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.
 rotor rotation.
 magnetic field.

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MORE MCQ ON Electromagnetic Field Theory

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