MAGNETISM AND ELECTROMAGNETISM QUIZ

The unit for permeability is

Wb

At/m

Wb/At × m

At/Wb

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A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be

0.24 N

24 N

240 N

2.4 N

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Indicate which of the following material does not retain magnetism permanently.

Soft iron

None of the listed here

Hardened steel

Stainless steel

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The commonly used material for shielding or screening magnetism is

Copper

Soft iron

Aluminium

Brass

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The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is

proportional to distance between the conductors

proportional to 7

proportional to X

inversely proportional to I

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The bar magnet has

None of the listed here

Both dipole and monopole moment

Monopole moment

Dipole moment

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A magnetic field exists around

Iron

Aluminium

Moving Charges

Copper

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A keeper is used to

Amplify flux

Change the direction of magnetic lines

Provide a closed path for flux

Restore lost flux

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The left hand rule correlates to

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

Current, magnetic field and direction of force on a conductor

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

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

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Ferrites are a sub-group of

Paramagnetic material

Ferro magnetic material

Non-magnetic materials

Ferri-magnetic material

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