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Electromagnetic Field Theory

Electromagnetic Field Theory
The minimum height of outer atmosphere is

100 km
150 km
200 km
400 km

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Electromagnetic Field Theory
The virtual height of an ionospheric layer is __________ true height

Less than
No relation
Equal to
Higher than

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Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, is

 1.15 joule.
 0.015 joule.
 0.15 joule.
 0.015 joule.

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Electromagnetic Field Theory
A sphere of radius with a uniform charge density ρv C/m3 shall have electric flux density at radius “r = a” equal to

 aρv/3 C/m2.
 aρv/4 C/m2.
 aρv C/m2.
 ρv/3 C/m2.

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Electromagnetic Field Theory
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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Electromagnetic Field Theory
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

Dust particles may not accumulate
Rain drops may not collect
Charge per unit area becomes very high for lightening to discharge
None of these

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MORE MCQ ON Electromagnetic Field Theory

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