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Chapter 13: Problem 1993

Read the assertion and reason carefully to mark the correct option out of the options given below. (A) If both assertion and reason are true and the reason is the correct explanation of the assertion. (B) If both assertion and reason are true but reason is not the correct explanation of the assertion, (C) If assertion is true but reason is false. (D) If the assertion and reason both the false. (E) If assertion is false but reason is true. Assertion: Diamagnetic materials can exhibit magnetism. Reason: Diamagnetic materials have permanent magnetic dipole moment.

Short Answer

Expert verified
The correct option is (C) If assertion is true but reason is false since diamagnetic materials can exhibit magnetism, but they do not have a permanent magnetic dipole moment.

Step by step solution

01

1. Understanding Diamagnetism

Diamagnetic materials are materials that do not possess any permanent magnetic dipole moment, and they repel an external magnetic field. The magnetization of these materials is weak and opposite to the applied magnetic field direction. Diamagnetism is due to the change in the orbital motion of electrons caused by an external magnetic field, which creates an induced magnetic field.
02

2. Assertion: Diamagnetic materials can exhibit magnetism

The assertion is true. Diamagnetic materials can exhibit magnetism, but it is weak and in the opposite direction to an applied external magnetic field. When an external magnetic field is removed, the induced magnetism in the material disappears. Example: Bismuth, copper, and silver are examples of diamagnetic materials.
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3. Reason: Diamagnetic materials have a permanent magnetic dipole moment

The reason is false. Diamagnetic materials do not have a permanent magnetic dipole moment because they have paired electrons, and their intrinsic magnetic moment cancels out. The temporary magnetism in diamagnetic materials is only created because of the change in the orbital motion of electrons in response to an external magnetic field.
04

4. Choosing the correct option

Since the assertion is true, but the reason is false, we choose the correct option as (C) If assertion is true but reason is false.

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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

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) \(\left[\left(2 \times 10^{-10}\right) / \mu_{0}\right]\)

A proton is projected with a speed of $2 \times 10^{6}(\mathrm{~m} / \mathrm{s})\( at an angle of \)60^{\circ}\( to the \)\mathrm{X}$ -axis. If a uniform mag. field of \(0.104\) tesla is applied along \(\mathrm{Y}\) -axis, the path of proton is (a) A circle of \(\mathrm{r}=0.2 \mathrm{~m}\) and time period $\pi \times 10^{-7} \mathrm{sec}$ (b) A circle of \(\mathrm{r}=0.1 \mathrm{~m}\) and time period $2 \pi \times 10^{-7} \mathrm{sec}$ (c) A helix of \(r=0.1 \mathrm{~m}\) and time period $2 \pi \times 10^{-7} \mathrm{sec}$ (d) A helix of \(\mathrm{r}=0.2 \mathrm{~m}\) and time period $4 \pi \times 10^{-7} \mathrm{sec}$

Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moment is (a) \(2: \pi\) (b) \(\pi: 2\) (c) \(\pi: 4\) (d) \(4: \pi\)

5: When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will become (a) Four times (b) Same (c) Half (d) Double
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