MAGNETISM AND ELECTROMAGNETISM QUIZ

The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

250 AT/m

2500 AT/m

0.25 AT/m

25 AT/m

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What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

300 At

200 At

100 At

150 At

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What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?

91.7 T

9.7 T

917 T

91 T

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Degaussing is the process of

Removal of magnetic impurities

Remagnetising metallic parts

Demagnetising metallic parts

Removing gases from the materials

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What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

2,400 At

240 At

2.4 At

24 At

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Which of the following is expected to have the maximum permeability ?

Ebolite

Zinc

Brass

Copper

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Susceptibility is positive for

ferromagnetic substances

non-magnetic substances

diamagnetic substances

None of these

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A permeable substance is one

which is a bad conductor

which is a strong magnet

through which the magnetic lines of force can pass very easily

which is a good conductor

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The main constituent of permalloy is

Nickel

Tungsten

Cobalt

Chromium

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

2.4 AT

0.24 AT

240 AT

24 AT

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YOUR ANSWER : ?

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