MAGNETISM AND ELECTROMAGNETISM QUIZ

The magnetic reluctance of a material

Decreases with increasing cross sectional area of material

Any of the listed here

Increases with increasing cross-sec-tional area of material

Does not vary with increasing cross-sectional area of material

TRUE ANSWER : ?
YOUR ANSWER : ?

The change of cross-sectional area of conductor in magnetic field will affect

reluctance of conductor

None of these

resistance of conductor

both of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Fleming's left hand rule is used to find

Direction of flux in a solenoid

Direction of magnetic field due to current carrying conductor

Direction of force on a current carrying conductor in a magnetic field

Polarity of a magnetic pole

TRUE ANSWER : ?
YOUR ANSWER : ?

A permeable substance is one

Which is a bad conductor

Which is a good conductor

Which is a strong magnet

Through which the magnetic lines of force can pass very easily

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnetising steel is normals difficult because

it has low permeability

it corrodes easily

it has high specific gravity

it has high permeability

TRUE ANSWER : ?
YOUR ANSWER : ?

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

91 T

9.7 T

917 T

TRUE ANSWER : ?
YOUR ANSWER : ?

Core of an electromagnet should have

None of the listed here

Low coercivity

High susceptibility

Both low coercivity and high susceptibility

TRUE ANSWER : ?
YOUR ANSWER : ?

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Remain same

Decreases

Increases

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Stainless steel

Hardened steel

None of the listed here

Soft iron

TRUE ANSWER : ?
YOUR ANSWER : ?

The magnetism left in the iron after exciting field has been removed is known as

susceptance

reluctance

residual magnetism

permeance

TRUE ANSWER : ?
YOUR ANSWER : ?

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