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Magnetism and Matter

Home / Boards / CBSE / Important Questions / Class 12 / Physics / Magnetism and Matter

Class 12 Physics Chapter 5
Magnetism and Matter
Important Questions

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Mastering a diverse array of question formats within ‘Magnetism and Matter’ holds paramount importance for the Class 12 syllabus. These class 12 physics magnetism and matter important questions and answers serve as an indispensable resource for comprehensive preparation. They equip students to confidently tackle uncertainties, augment their self-assurance, and refine their problem-solving skills. Engaging with these important questions magnetism and matter enables students to strengthen their grasp of the fundamental concepts in this field. With the aim of solidifying knowledge in this domain, these important questions from magnetism and matter ensure that students approach their exams with a sense of confidence and proficiency.

Introduction

Exploring ‘Magnetism and Matter’ unveils an enthralling chapter in Class 12 Physics, delving into the captivating realm of electromagnetic principles and their practical implications. This section encompasses core concepts such as magnetic properties of matter, magnetic materials’ behavior, hysteresis, and their intricate interconnections. Mastery of these principles extends beyond theory, holding immense practical significance across diverse technological domains. This chapter unravels the complexities of magnetic interactions in matter, behaviors of magnetic substances, and their crucial role in technological advancements. By engaging with important questions in magnetism and matter, the objective is to attain a comprehensive understanding of this pivotal chapter.

What are Magnetism and Matter?

Magnetism and Matter” is a segment of physics that explores the interactions between magnetic fields and different types of materials. It delves into how materials respond to magnetic fields, their inherent magnetic properties, and how magnetic fields influence their behavior. This study involves understanding magnetic materials, their ability to become magnetized, retain magnetism, and the phenomena like hysteresis associated with magnetic substances. The subject investigates the relationship between matter and magnetism, elucidating how materials can be affected by and interact with magnetic fields. oswal.io provides important questions for class 12 physics magnetism and matter which can help you in preparing for examination.

Class 12 Physics Magnetism and Matter Important Questions and Answers

Q1. In the case of bar magnet, lines of magnetic induction:
Options
(a) run continuously through the bar and outside
(b) emerge in circular paths from the middle of the bar
(c) are produced only at the north pole like rays of light from a bulb
(d) start from the north pole and end at the south pole

Ans. (a) run continuously through the bar and outside

Explanation:
In the bar magnet, lines of magnetic induction run continuously through the bar and outside.

Q2. When a ferromagnetic substance is heated above Curie temperature, then :
Options
(a) it is demagnetised
(b) it becomes diamagnetic
(c) it becomes paramagnetic
(d) it remains unaffected

Ans. (c) it becomes paramagnetic

Explanation: When a ferromagnetic substance is heated to a very high temperature it looses its magnetic property Ferromagnetic substances becomes paramagnetic. This happens because of the disorderness of the electron arrangement.

Q3. A bar magnet of magnetic moment 0.1 Am² is placed in a magnetic field of strength 0.5 T, making an angle of 30° with the field. Calculate the torque experienced by the magnet.

Explanation:
To calculate the torque experienced by the bar magnet, we can substitute the given values of the magnetic moment \text{(m = 0.1 Am}^2), the magnetic field strength (B = 0.5 T), and the angle (θ = 30°) into the torque expression τ = M × B × sin θ.
\text{τ = 0.1 Am}^2 × 0.5T × sin(30°) = 0.025 Nm

Q4. Out of the two magnetic materials, ‘A’ has relative permeability slightly greater than unity while ‘B’ has less than unity. Identify the nature of the materials ‘A’ and ‘B’. Will their susceptibilities be positive or negative ?

Explanation:
For a paramagnetic material, the relative permeability lies between 1 < μ_r < 1 + ε and its susceptibility lies between 0 < x < ε.
Hence. 'A' is a paramagnetic material and its susceptibility is positive. This is because its relative permeability is slightly greater than unity. For a diamagnetic material, the relative permeability lies between 0 ≤ μ_r < 1 and its susceptibility lies between-1<x<0. Hence, 'B' is a diamagnetic material and its susceptibility is negative. This is because its relative permeability is less than unity.
Here μ_r and x refer to the relative permeability and susceptibility.

Q5. Can two magnetic lines of forces intersect ? Justify your answers.

Explanation:
No, because if two magnetic lines of force intersect, then there will be two tangents and hence there will be two directions of magnetic field at the point of intersection, which is impossible.

CBSE Class 12 Physics Chapter wise Important Questions

Chapter No.Chapter Name
Chapter 1Electric Charges and Fields
Chapter 2Electrostatic Potential and Capacitance
Chapter 3Current Electricity
Chapter 4Moving Charges and Magnetism
Chapter 5Magnetism and Matter
Chapter 6Electromagnetic Induction
Chapter 7Alternating current
Chapter 8Electromagnetic Waves
Chapter 9Ray Optics and Optical Instruments
Chapter 10Wave Optics
Chapter 11Dual Nature of Radiation and Matter
Chapter 12Atoms
Chapter 13Nuclei
Chapter 14Semiconductor Electronics: Materials, Devices and Simple Circuits

Conclusion

Understanding the fundamental principles guiding how materials interact with magnetic fields is crucial in comprehending Magnetism and Matter in Class 12 Physics. Platforms such as oswal.io offer class 12 physics magnetism and matter important questions and answers enabling comprehensive learning and preparation. These resources serve as valuable tools for students to master the essential aspects of electromagnetic science, thereby strengthening their understanding of this pivotal aspect of physics.

Frequently Asked Questions

Ans: Magnetic hysteresis is the phenomenon where a material retains some magnetization even after the magnetic field causing that magnetization is removed. It reflects the lag in magnetization with changes in the magnetic field.
Ans: Magnetic domains are microscopic regions within ferromagnetic materials where atomic magnetic moments align. Understanding their behavior and how they can be aligned or reoriented affects the overall magnetic properties of the material.
Ans: The Curie temperature is the temperature at which certain materials undergo a phase transition and lose their ferromagnetic properties. Above this temperature, these materials become paramagnetic.
Ans: Magnetization refers to the process of aligning magnetic domains within a material, inducing a magnetic field. It determines the material’s magnetic properties, including its ability to attract or repel other materials.
Ans: Magnetic materials are crucial in various technologies such as data storage (like hard drives), electromagnets, MRI machines in medical imaging, electric motors, transformers, and numerous electronic devices. Understanding their behavior is integral to optimizing these applications.
Chapter Wise  Important Questions for CBSE Board Class 12 Physics
Electric Charges and Fields
Electrostatic Potential and Capacitance
Current Electricity
Moving Charges and Magnetism
Magnetism and Matter
Electromagnetic Induction
Alternating current
Electromagnetic Waves
Ray Optics and Optical Instruments
Wave Optics
Dual Nature of Radiation and Matter
Atoms
Nuclei
Semiconductor Electronics: Materials, Devices and Simple Circuits
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