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IMPORTANT
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When a ferromagnetic material is heated to a temperature above its Curie temperature, the material
 

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Important Questions on Matter and Magnetism

HARD
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 26 - Matter and Magnetism>Exercise 1>Q 125
A bar magnet having coercivity 4×103 A m-1 is demagnetised by inserting it inside a solenoid 10 cm long and having 50 turns. The current that should be sent through the solenoid is
 
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 26 - Matter and Magnetism>Exercise 1>Q 126
How does the magnetic susceptibility X of a paramagnetic material change with absolute temperature T?
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 26 - Matter and Magnetism>Exercise 1>Q 127
The hysteresis loop for the material of a permanent magnet is :
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 26 - Matter and Magnetism>Exercise 1>Q 128

Select the incorrect alternative (s).

When a ferromagnetic material goes through a complete cycle of magnetisation, the magnetic susceptibility 

EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 26 - Matter and Magnetism>Exercise 1>Q 129
The material for making permanent magnets should have
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 26 - Matter and Magnetism>Exercise 1>Q 130
A paramagnetic material has 1028 atoms m-3. Its magnetic susceptibility at temperature 350 K is 2.8×10-4. Its susceptibility at 300 K is