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Chapter 13: Problem 1979

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 \(\mathrm{N}_{2}\)

Short Answer

Expert verified
The correct answer is (a) Attract \(N_{1}\) strongly, \(N_{2}\) weakly, and repel \(N_{3}\) weakly.

Step by step solution

01

Considering the properties of ferromagnetic materials

A ferromagnetic material has a strong magnetic moment and gets attracted to a magnetic field. When a magnet is brought close to a ferromagnetic material, it will be attracted strongly.
02

Considering the properties of paramagnetic materials

A paramagnetic material has a weak magnetic moment and gets attracted to a magnetic field but to a smaller extent compared to ferromagnetic materials. When a magnet is brought close to a paramagnetic material, it will be attracted weakly.
03

Considering the properties of diamagnetic materials

A diamagnetic material has no inherent magnetic moment and gets weakly repelled by a magnetic field. When a magnet is brought close to a diamagnetic material, it will be repelled weakly.
04

Matching the results with the given options

According to our analysis: - N1, which is made of a ferromagnetic substance, will be attracted strongly - N2, which is made of a paramagnetic substance, will be attracted weakly - N3, which is made of a diamagnetic substance, will be repelled weakly Comparing these findings with the given options, we can conclude that the correct answer is (a) Attract N1 strongly, N2 weakly, and repel N3 weakly.

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Most popular questions from this chapter

1: A charged particle moves in a uniform mag. field. The velocity of the particle at some instant makes an acute angle with the mag. field. The path of the particle will be (a) A straight line (b) A circle (c) A helix with uniform pitch (d) A helix with non-uniform pitch

Force between two identical bar magnets whose centers are I meter apart is \(4.8 \mathrm{~N}\), when their axes are in the same line. If separation is increased to \(2 r\), the force between them is reduced to (a) \(2.4 \mathrm{~N}\) (b) \(1.2 \mathrm{~N}\) (c) \(0.6 \mathrm{~N}\) (d) \(0.3 \mathrm{~N}\)

A He nucleus makes a full rotation in a circle of radius \(0.8\) meter in $2 \mathrm{sec}\(. The value of the mag. field \)\mathrm{B}$ at the centre of the circle will be \(\quad\) Tesla. (a) \(\left(10^{-19} / \mu_{0}\right)\) (b) \(10^{-19} \mu_{0}\) (c) \(2 \times 10^{-10} \mathrm{H}_{0}\) (d) \(\left[\left(2 \times 10^{-10}\right) / \mu_{0}\right]\)

If two streams of protons move parallel to each other in the same direction, then they (a) Do not exert any force on each other (b) Repel each other (c) Attract each other (d) Get rotated to be perpendicular to each other.

If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be (a) Only inside the pipe (b) Only outside the pipe (c) Neither inside nor outside the pipe (d) Both inside and outside the pipe
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