ELECTROMAGNETIC FIELD THEORY QUIZ

The useful magnetic flux obtainable from any closed surface is

Both A and B

Constant

None of these

Unity

TRUE ANSWER : ?
YOUR ANSWER : ?

The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

24 mH.

48 mH.

3 mH.

12 mH.

TRUE ANSWER : ?
YOUR ANSWER : ?

A conductor of length 1 metre moves at right angles to magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced emf in the conductor will be

100 V.

25 V.

75 V.

50 V.

TRUE ANSWER : ?
YOUR ANSWER : ?

The attenuation in waveguide above to cut off frequency

Very low

Very high

Infinite

Zero

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YOUR ANSWER : ?

Which of following can induce the maximum induced voltage ?

1 amp 100 Hz.

1 amp 1 Hz.

1 amp dc.

20 amp dc.

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YOUR ANSWER : ?

The main purpose of choke is

to block low frequencies.

to pass high frequencies.

to pass low frequencies.

none of above.

TRUE ANSWER : ?
YOUR ANSWER : ?

Electric flux in coulombs emanating from any surface of a cube containing C coulombs of charge at its centre is

Q / 6.

Q / 6ε.

4πQ / 6ε.

Q / 4π.

TRUE ANSWER : ?
YOUR ANSWER : ?

For a linear electromagnetic circuit, which of the following statement is true?

Field energy is lesser than the co-energy.

Field energy is equal to the co-energy.

Field energy is greater than the co-energy.

Co-energy is zero.

TRUE ANSWER : ?
YOUR ANSWER : ?

A coil of 300 turns is wound on a non magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The inductance of the coil corresponding to a magnetizing current of 6 A will be

113.04 μH.

3.768 μH.

1.1304 μH.

37.68 μH.

TRUE ANSWER : ?
YOUR ANSWER : ?

In a perfect conductor the incident and reflected wave combine to produce

A stronger incident wave

A standing wave which is not progressing

A stronger reflected wave

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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