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Electromagnetic Field Theory

Electromagnetic Field Theory
A medium is said to be isotropic when

 ∈ = μσ.
 ∈ is zero.
 ∈ is a scalar constant.
 ∈ = μ.

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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.
 4.
 2.
 0.5.

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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = cosφ Ir + sinφ Iφ.
 A = cosφ Ir.
 A = sinφ Ir.
 A = cosφ Ir - sinφ Ir.

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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)

  QD.
 QR2/d.
 QR.
 Q√(R2 + d2).

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Electromagnetic Field Theory
In an iron core coil the iron core is removed so that the coil becomes an air core coil. The inductance of the coil will

 decrease.
 increase.
 remain the same.
 initially increase and then decrease.

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Electromagnetic Field Theory
For an inductor, current is proportional to

 none of them.
 magnetic field.
 both (A) and (B).
 voltage across the inductor.

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MORE MCQ ON Electromagnetic Field Theory

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