ELECTROMAGNETIC FIELD THEORY QUIZ

How much current must flow in a loop of radius 1m to produce a magnetic field of 1 mA/m?

2 mA.

1.5 mA.

2.5 mA.

1mA.

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The virtual height of an ionospheric layer is __________ true height

No relation

Higher than

Less than

Equal to

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Which of following can induce the maximum induced voltage ?

1 amp dc.

1 amp 100 Hz.

20 amp dc.

1 amp 1 Hz.

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In above problem, if the inductance L1 and L2 in series aiding with 30 mH mutual inductance, then total inductance will be

50 mH.

100 mH.

150 mH.

200 mH.

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

rotor rotation.

magnetic field.

induced emf.

None of these

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The power gain of a half-wave dipole with respect to an isotropic radiator is

2.15 db

4.15 db

3 db

6 db

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Two identical circular coils, one closed and another is little split (not enclosed) are placed in an uniform magnetic field which decrease at a constant rate. If the plane to the coils are perpendicular to the field which of the following statements is true?

An emf is induced in split coil.

Equal joule heating occurs in both coils.

An emf is induced in both coils.

Joule heating does not occur in each of the coils.

TRUE ANSWER : ?
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Conductor is constant and field is varying then emf will be induced. This principle is called

static induced emf.

virtually induced emf.

dynamically induced emf.

None of these

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Electric field strength of charge

Increase distance.

Decrease with distance.

Increase square distance.

Decrease with square distance.

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The emf induced in a conductor rotating in bipolar field is

none of these.

DC.

AC.

DC and AC both.

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