Question

Three identical bars $A,B$ and $C$ are made of different magnetic materials. When kept in a uniform magnetic field, the field lines around them look as follows:
Make the correspondence of these bars with their material being diamagnetic $\left(D\right)$, ferromagnetic $\left(F\right)$ and paramagnetic $\left(P\right)$:

• A. $A\leftrightarrow F,B\leftrightarrow P,C\leftrightarrow D$
• B. $A\leftrightarrow P,B\leftrightarrow F,C\leftrightarrow D$
• C. $A\leftrightarrow D,B\leftrightarrow P,C\leftrightarrow F$
• D. $A\leftrightarrow F,B\leftrightarrow D,C\leftrightarrow P$

Answer 1

The correct option is D $A\leftrightarrow F,B\leftrightarrow D,C\leftrightarrow P$

A. $⟶$ Ferromagnetic as field lines passes through the bases.

B. $⟶$ Diamagnetic as does not get into the base.

C. $⟶$ Para-magnetic as some of the lines get deflected and some of them passes.