MAGNETISM AND ELECTROMAGNETISM QUIZ

For a given wirewound core, an increase in current through the coil

decreases the flux density

increases the flux density

reverses the flux lines

causes no change in flux density

TRUE ANSWER : ?
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One telsa is equal to

1 Wb/mm²

1 mWb/m²

1 Wb/m

1 Wb/m²

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A permeable substance is one

Which is a bad conductor

Through which the magnetic lines of force can pass very easily

Which is a good conductor

Which is a strong magnet

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The bar magnet has

Both dipole and monopole moment

Dipole moment

None of the listed here

Monopole moment

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

8

12

6

4

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The left hand rule correlates to

Current, magnetic field and direction of force on a conductor

Current, induced e.m.f. and direction of force on a conductor

Self induction, mutual induction and direction of force on a conductor

Magnetic field, electric field and direction of force on a conductor

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For which of the following materials the saturation value is the highest?

Ferromagnetic materials

Ferrites

Diamagnetic materials

Paramagnetic materials

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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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The unit for reluctance is

At/m

tesla

Wb

At/Wb

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The main constituent of permalloy is

Chromium

Cobalt

Nickel

Tungsten

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