Related Questions

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
Paramagnetic materials have relative permeability
A slightly less than unity
B equal to unity
C slightly more than unity
D equal to that ferromagnetic mate rials
নিচের কোনটি প্যারাচৌম্বক পদার্থ (Paramagnetic Substance) ?
A Na
B Fe
C He
D H2O
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
Paramagnetic alpha iron changes to gamma iron at
A 770°C
B 912°C
C 1440°C
D 1539°C
Which is the strongest paramagnetic gas?
A CO2
B O2
C NO
D NO2
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?
A CO2
B O2
C NO
D NO2
নিচের কোন ধাতুটির চৌম্বক প্রবনতা (magnetic susceptibility) সবচেয়ে বেশি?
A নিকেল
B নরম লোহা
C কোবাল্ট
D শক্ত লোহা
The susceptibility is independent of temperature in which material?
A Paramagnetic
B Ferromagnetic
C Diamagnetic
D Ferromagnetic
Susceptibility is positive for
A non-magnetic substances
B diamagnetic substances
C ferromagnetic substances
D none of the above

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