When does a ferromagnetic material become paramagnetic material?

Consider the following statements: 1. Both ferromagnetic and ferrimagnetic materials have domain structures; each domain has randomly oriented magnetic moments when no external field is applied. 2. Both ferromagnetic and ferrimagnetic materials make those domains that have a favourable orientation to the applied field grow in size. 3. The net magnetic moment in ferromagnetic materials is higher than that in ferrimagnetic materials. 4. The net magnetic moment in ferrimagnetic materials is higher than that in ferromagnetic material. Which of the above statements are correct?

A

1 and 4 only

B

1, 2 and 4

C

2 and 4 only

D

1, 2 and 3

Consider the following statements regarding a ferromagnetic material: 1. Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit a hysteresis effect. 2. The coercive force is the field required to reduce the flux density to zero. Which of the above statements is/are correct?

A

Both 1 and 2

B

Neither 1 nor 2

C

1 only

D

2 only

When does a ferromagnetic material become a paramagnetic material?

A

At Curie temperature only

B

Below Curie temperature

C

Above Curie temperature

D

Never

Assertion (A) The ferromagnetic substances do not obey Curie's law.
Reason (R) At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true, but R is not the correct explanation of A

C

A is true, but R is false

D

A is false, but R is true

At what temperature, a ferromagnetic material becomes paramagnetic material?

A

Melting temperature

B

Curie temperature

C

Neel temperature

D

None of the above

The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

A

768

B

1127

C

1359

D

1480

Some magnetic materials may be classified on the basis of 1. Susceptibility 2. Saturation 3. Spin arrangement 4. Nature of hysteresis loop 5. Domain structure 6. Critical temperature above which it behaves as a paramagnetic material Which of these can be used to distinguish between ferri and ferromagnetic materials?

A

1, 3 and 4 only

B

2, 3 and 6 only

C

3, 4 and 5 only

D

1, 2, 3, 4, 5 and 6

When does a paramagnetic material become diamagnetic material?

A

At critical temperature

B

Above critical temperature

C

Below critical temperature

D

Never

The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

A

770°C

B

910°C

C

1050°C

D

Below recrystallization temperature

The correct order of Magnetic susceptibility of Paramagnetic (χMP), diamagnetic (χMD), ferromagnetic (χMF) materials is

A

χ_MP > χ_MD > χ_MF

B

χ_MP > χ_MF > χ_MD

C

χ_MD > χ_MF > χ_MP

D

χ_MF > χ_MP > χ_MD

E

χMF < χMP < χMD

When does a ferromagnetic material become paramagnetic material?

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