ELECTROMAGNETIC FIELD THEORY QUIZ

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)

Q√(R2 + d2).

QR2/d.

QR.

QD.

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A conductor of length L has current I passing through it, when it is placed parallel to strong magnetic field. The force experienced by the conductor will be

BI2L.

zero.

BL2I.

BIL.

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Which is the major factor for determining whether a medium is free space, lossless dielectric or a good conductor

Reflector coefficient.

Constitutive parameters.

Loss tangent.

Attenuation constant.

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Biot-Savarts law states the relation between magnetic intensity and

volume current only.

(A), (B), and (D) are all correct.

surface current only.

filament current only.

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For a line characteristic impedance zo terminated is load zo/3, the reflection coefficient is

1/3.

2/3.

– 1/3.

– ½.

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Which of following is true for a purely inductive circuit ?

Reactive power of the circuit is zero.

Actual power of the circuit is zero.

Any capacitance even if present in the circuit will not be charged.

Apparent power of the circuit is zero.

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The developed electromagnetic force and or torque in electromechanical energy conversion system act in a direction that tends

to decrease the stored energy at constant flux.

to decrease the stored energy at constant mmf.

to increase the stored energy at constant flux.

to decrease the co-energy at constant mmf.

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In frec space E (z,t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z,t)

(103/377) sin(ωt - β z)(-ux) A/m.

(103/377) sin(ωt - β z)(-uy) A/m.

None of above.

(103/377) cos(ωt - β z)(-ux) A/m.

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A metal sphere with 1 m radius and a surface charge density of 10 coulombs/m2 is enclosed in a cube of 10 m side. The total outward electric displacement normal to the surface of the cube is

40π C.

None of above.

5 C.

10 C.

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A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

None of these.

Ex = Ey = 0, By = Bz = 0.

Ex = Ey = 0, Bx = By = 0.

Ey = Ez = 0, By = Bz = 0.

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