Question

There are three needles $N_1$, $N_2$ and $N_3$ made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. When a magnet is brought close to them, then it will

• A. attract $N_2$ strongly, $N_1$ and $N_3$ weakly.
• B. attract $N_1$ strongly, repel $N_2$ and $N_3$ weakly.
• C. attract $N_1$ strongly, $N_2$ and $N_3$ weakly.
• D. attract $N_1$ strongly and $N_2$ weakly, repel $N_3$ weakly.

Hint:

Ferromagnetic $\gg$ Paramagnetic $>$ Diamagnetic in magnetic response.

Answer 1

The Correct Option is D

Step 1: Behaviour of ferromagnetic substances.
Ferromagnetic substances are strongly attracted by a magnet due to large magnetic susceptibility.
Step 2: Behaviour of paramagnetic substances.
Paramagnetic substances are weakly attracted by a magnet.
Step 3: Behaviour of diamagnetic substances.
Diamagnetic substances are weakly repelled by a magnet.
Step 4: Apply to given needles.
$N_1$ (ferromagnetic) is strongly attracted, $N_2$ (paramagnetic) is weakly attracted, $N_3$ (diamagnetic) is weakly repelled.