MAGNETISM AND ELECTROMAGNETISM QUIZ

What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?

4

8

6

12

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The commonly used material for shielding or screening magnetism is

Copper

Soft iron

Brass

Aluminium

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What is the mmf of a wire with 8 turns carrying three amperes of current?

2.4 AT

240 AT

24 AT

0.24 AT

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The unit of relative permeability is

Hennry

None of the listed here

Its dimensionless

Hennry/meter

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Which of the following materials are diamagnetic?

Silver and copper

Iron

Silver

Copper

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The magnetic reluctance of a material

Does not vary with increasing cross-sectional area of material

Increases with increasing cross-sec-tional area of material

Any of the listed here

Decreases with increasing cross sectional area of material

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For which of the following materials the net magnetic moment should be zero?

diamagnetic materials

ferrimagnetic materials

antiferromagnetic materials

antiferrimagnetic materials

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The initial permeability of an iron rod is

The permeability almost in non-magnetised state

The lowest permeability of the iron rod

The permeability at the end of the iron rod

The highest permeability of the iron rod

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The attraction capacity of electromagnet will increase if the

Flux density decreases

Core area increases

Flux density increases

Core length increases

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The retentivity of material is useful for the construction of

Transformers

Electromagnets

Permanent magnets

Non-magnetic substances

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