A bar of paramagnetic material is placed in a strong external magnetic field. Then, the field inside it is likely to

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This question was previously asked in

ALP CBT 2 Physics and Maths Previous Paper 1 (Held On: 21 Jan 2019 Shift 1)

Answer 1

CONCEPT:

Paramagnetic substances are those which develop feeble magnetization in the direction of the magnetizing field.
Such substances are feebly attracted by magnets and tend to move from weaker to stronger parts of a magnetic field.
Magnetic susceptibility is small and positive i.e. 0 < χ.
Example: Manganese, aluminum, chromium, platinum, etc.

EXPLANATION:

When a paramagnetic substance is placed in a strong magnetising field, the magnetic field lines prefer to pass through the specimen rather than through air.
Thus magnetic induction inside the sample is more than the magnetic induction outside the sample. Therefore option 2 is correct.

Physics ST 3 Group X jitendra kumar D2

Diamagnetic substances:

Diamagnetic substances are those which develop feeble magnetization in the opposite direction of the magnetizing field.
Such substances are feebly repelled by magnets and tend to move from stronger to weaker parts of a magnetic field.
Magnetic susceptibility is small and negative i.e. -1 ≤ χ ≤ 0.
Examples: Bismuth, copper, lead, zinc, etc.

Ferromagnetic substances:

Ferromagnetic substances are those which develop strong magnetization in the direction of the magnetizing field.
They are strongly attracted by a magnet and tend to move from weaker to the stronger part of a magnetic field.
Magnetic susceptibility is very large and positive i.e. χ > 1000
Example: Iron, cobalt, nickel, gadolinium, and alloys like alnico.