NAEST 2020 The force of attraction between an iron nail and

Question: The nail got attracted towards the magnet in Case-1 and in Case-2. The possible reason could be

1. The nail was already strongly magnetized
2. The nail got magnetized when it was placed near the magnet
3. The nail was made of a ferromagnetic material
4. the nail was made of a diamagnetic material
5. The nail was made of a paramagnetic material

केस-1 और केस-2 दोनों में कील चुंबक की ओर आकर्षित होती है। इसकी संभावित वज़ह हो सकती है

1. कील पहले से ही चुंबकित थी
2. चुंबक के नजदीक रखने से कील चुंबकित हो गयी
3. कील एक लौह चुंबकीय पदार्थ की बनी है
4. कील अनुचुंबकीय पदार्थ की बनी है
5. कील प्रतिचुंबकीय पदार्थ की बनी है

Solution: If the nail was already strongly magnetized then its one end should be attracted by one pole of the bar magnet and repelled by another pole.

The nail got magnetized when it was placed near the magnet. The south pole of the magnetized nail is not attracted well by the south pole of the magnet. Option (B) is correct.

The nail is made of iron, a ferromagnetic material. Option (C) is correct.

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