Needles N1, N2 and N3 are made of a ferromagnetic, a...

Needles $\mathrm{N}_{1}, \mathrm{~N}_{2}$ and $\mathrm{N}_{3}$ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will (a) Attract $\mathrm{N}_{1}$ strongly, $\mathrm{N}_{2}$ weakly and repel $\mathrm{N}_{3}$ weakly (b) Attract $\mathrm{N}_{1}$ strongly, but repel $\mathrm{N}_{2}$ and $\mathrm{N}_{3}$ weakly (c) Attract all three of them (d) Attract $\mathrm{N}_{1}$ and $\mathrm{N}_{2}$ strongly but repel $\mathrm{N}_{2}$

Needles $\mathrm{N}_{1}, \mathrm{~N}_{2}$ and $\mathrm{N}_{3}$ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will
(a) Attract $\mathrm{N}_{1}$ strongly, $\mathrm{N}_{2}$ weakly and repel $\mathrm{N}_{3}$ weakly
(b) Attract $\mathrm{N}_{1}$ strongly, but repel $\mathrm{N}_{2}$ and $\mathrm{N}_{3}$ weakly
(c) Attract all three of them
(d) Attract $\mathrm{N}_{1}$ and $\mathrm{N}_{2}$ strongly but repel $\mathrm{N}_{2}$

Key Concepts

Ferromagnetism

Ferromagnetism is a type of magnetism where certain materials, often iron, cobalt, and nickel, exhibit strong, permanent magnetic moments due to the alignment of magnetic domains. In these materials, the magnetic moments of atoms or ions line up spontaneously in the same direction below a specific temperature (the Curie temperature), resulting in a strong attraction to a magnet.

Paramagnetism

Paramagnetism occurs in materials that have unpaired electrons and thus possess a small magnetic moment, but the magnetic domains do not interact strongly or align spontaneously. When an external magnetic field is applied, these materials become weakly magnetized in the direction of the field, exhibiting a weak attraction, and the effect disappears once the external field is removed.

Diamagnetism

Diamagnetism is a form of magnetism where materials create an induced magnetic field in a direction opposite to an externally applied magnetic field, due to changes in their electron orbital motions. This results in a very weak repulsion from the magnet, as no permanent magnetic moment exists in these materials.

Transcript

00:01 Okay, as per the question, three needles are there, n1, n2 and n3.

00:07 So n1, that is made of ferromagnetic material.

00:12 It is ferromagnetic, okay? and n2, that is of paramagnetic, okay? it is paramagnetic and n3 that is diamagnetic.

00:26 It is diamagnetic.

00:28 So, a magnet when brought close to them, what will be there? there will be attraction, there will be repulsion, weak repulsion, strong attraction, what will be there, okay? so to understand this, you should understand first of all the magnetic susceptibility.

00:48 This is the graph between magnetic susceptibility and the temperature, okay, and that goes like this.

00:54 And here it become negative okay so this portion it is called the curie temperature okay and it is also tc dash okay so here three phase of the materials are there okay it is ferro magnetism it is paramagnetism and it is diamagnetism okay so higher the magnetic susceptibility okay the higher will be attraction or repulsion.

01:25 Higher, okay, higher will, higher the, you should understand the concept, okay, higher the magnetic susceptibility, then higher will be the attraction or repulsion, okay? and if magnetic susceptibility is positive, then there will be attraction and if it is negative, then there will be negative, there will be repulsion, okay? so, looking at this graph, okay, for pharaoh magnetism, okay? ferro magnetism, their higher magnetic susceptibility, okay? we can say big, big magnetic susceptibility, magnetic susceptibility, and that is too positive.

02:15 Okay, so positive, due to positive, there will be attraction and higher magnetic susceptibility so that there will be strong, strong attraction, okay? so it will be strong attraction...

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