MAGNETISM AND ELECTROMAGNETISM QUIZ

What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m?

4 AT

10 AT

16 AT

8 AT

TRUE ANSWER : ?
YOUR ANSWER : ?

The unit of flux is the same as that of

Resistance

Pole strength

Permanance

Reluctance

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

24 At

2.4 At

240 At

2,400 At

TRUE ANSWER : ?
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Magnetism of a magnet can be destroyed by

Heating

All of the listed here

Hammering

By inductive action of another magnet

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When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

decreases

remains constant

increases

reaches zero

TRUE ANSWER : ?
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The susceptibility of paramagnetic materials generally lies between

KT4 and KT8

10"2 and KT5

1CT3 and 1CT7

KT3 and 1CT6

TRUE ANSWER : ?
YOUR ANSWER : ?

The attraction capacity of electromagnet will increase if the

Core area increases

Core length increases

Flux density decreases

Flux density increases

TRUE ANSWER : ?
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A permanent magnet

Attracts only ferromagnetic substances

Attracts some substances and repels others

Attracts all paramagnetic substances and repels others

Attracts ferromagnetic substances and repels all others

TRUE ANSWER : ?
YOUR ANSWER : ?

The relative permeability of materials is not constant.

Ferromagnetic

Diamagnetic

None of the listed here

Paramagnetic

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

30 At

187 At

300 At

18.75 At

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YOUR ANSWER : ?

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