NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Magnetic Properties of Matter
NEET · Physics · Magnetic Properties of Matter
Read the following statements regarding the magnetic properties of...
Read the following statements regarding the magnetic properties of materials:
(I) For a perfect diamagnet (such as a superconductor), the magnetic susceptibility is and relative permeability is .
(II) For paramagnetic materials, the relative permeability is slightly less than .
(III) For ferromagnetic materials, the magnetic susceptibility is large and positive, and .
(IV) Diamagnetic materials have a small positive magnetic susceptibility.
How many of the above statements are correct?
(I) For a perfect diamagnet (such as a superconductor), the magnetic susceptibility is and relative permeability is .
(II) For paramagnetic materials, the relative permeability is slightly less than .
(III) For ferromagnetic materials, the magnetic susceptibility is large and positive, and .
(IV) Diamagnetic materials have a small positive magnetic susceptibility.
How many of the above statements are correct?
Options
- AOnly one
- BOnly two
- COnly three
- DAll four
Correct answer
B. Only two
Step-by-step solution
Statement (I) is correct: A superconductor exhibits perfect diamagnetism (Meissner effect), where and .
Statement (II) is incorrect: For paramagnetic materials, is small and positive, so is slightly greater than .
Statement (III) is correct: For ferromagnetic materials, . Since , it follows that .
Statement (IV) is incorrect: Diamagnetic materials have a small negative magnetic susceptibility ().
Therefore, exactly two statements are correct.
Answer: Only two
Statement (II) is incorrect: For paramagnetic materials, is small and positive, so is slightly greater than .
Statement (III) is correct: For ferromagnetic materials, . Since , it follows that .
Statement (IV) is incorrect: Diamagnetic materials have a small negative magnetic susceptibility ().
Therefore, exactly two statements are correct.
Answer: Only two