As the Class 12 Physics board exam is scheduled for February 20, 2026, students need targeted preparation and that starts with practicing Important Questions for Class 12 Physics Chapter 5.
Magnetism and Matter consistently contributes direct theory-based marks in the board paper.
Students may lose easy marks here due to weak definitions or incomplete derivations. By revising the right Magnetism And Matter Class 12 Important Questions, you can score well.
Magnetism And Matter Class 12 Important Questions
The chapter Magnetism and Matter mainly focuses on magnetic properties of materials and the concept of magnetic dipoles. Students should carefully revise all definitions, diagrams, and derivations from Magnetism And Matter Class 12 Solutions.
Writing clear explanations with proper terminology is essential to score full marks in theory-based questions from Important Questions for Class 12 Physics Chapter 5. Below are the Magnetism And Matter Class 12 Question Answers:
1. S.I. unit of pole strength is [OD 2017, 2010]
(A) N
(B) N/A-m
(C) A-m
(D) T
2. Which of the following is an example for diamagnetic substances? [OD 2014]
(A) copper
(B) nickel
(C) aluminium
(D) iron
Sol. (A)
Copper is an example of diamagnetic substance. And nickel, aluminium, iron are substances. Thus (A) is correct option.
3. The vertical component of the earth's magnetic field is zero at a place where the angle is dip is [Foreign 2019]
(A) 0°
(B) 45°
(C) 60°
(D) 90°
Sol. (A)
Given:
Vertical component of earth's magnetic field,
4. What is the importance of radial magnetic field in a moving coil galvanometer? [Delhi 2014]
Sol. 1. The plane of the coil remains parallel to the direction of magnetic field. So, the galvanometer is linear.
2. It is a stronger magnetic field as compared to the magnetic field produced by the flat pieces of a field magnet.
5. Why does paramagnetic substance move from weaker to stronger parts of non-uniform magnetic field? [OD 2018, Comp 2006]
Sol. The atoms of paramagnetic substances posses permanent magnetic dipoles and these dipoles are randomly distributed in the absence of external magnetic field. But when the paramagnetic substance is subjected to a non-uniform magnetic field, each atom experiences a torque tendency to align its magnetic dipole moment along the direction of magnetic field, and thus a paramagnetic substance moves from weaker to stronger magnetic field.
6. A short bar magnet, placed with its axis making an angle with a uniform magnetic field B, experiences a torque. What is the magnetic moment of the magnet? [Dehi 2017]
7. Derive relation between relative magnetic permeability and magnetic susceptibility. [Delhi 2012, OD 2017]
8. Distinguish between soft and hard ferromagnetic materials. Give examples of each type. [Delhi 2017]
Sol. Ferromagnetic materials can be divided into two categories:
1. Soft Ferromagnetic Materials or Soft Ferromagnets: These are the ferromagnetic materials in which the magnetisation disappears on the removal of the external magnetising field. They have low retentivity, low coercivity, and low hysteresis loss. But they have high relative magnetic permeability. They are used as cores of solenoids and transformers.
Examples: Soft iron, mu metal, stalloy, etc.
2. Hard Ferromagnetic Materials or Hard Ferromagnets: These are the ferromagnetic materials which retain magnetisation even after the removal of the external magnetising field. They have high retentivity, high coercivity and large hysteresis loss. They are used for making permanent magnets.
Examples: Steel, alnico, lodestone, ticonal, etc
9. A small magnet of magnetic moment M, is placed at a distance r from the origin O with its axis parallel to X-axis as shown. A small coil, if one turn is placed on the X-axis, at the same distance from the origin, with the axis of the coil coinciding with X-axis. For what value of current in the coil does a small magnetic needle, kept at origin, remains undefiled? What is the direction of current in the coil ?
This happens when magnetic field of bar magnet is equal and opposite to the magnetic field of coil
Sol. Oscillations of a Freely Suspended Magnet in a Magnetic Field. In the position of equilibrium, the magnetic dipole lies along B. When it is slightly rotated from this position and released, it begins to vibrate about the field direction under the restoring torque,
If I is the moment of inertia of the magnet, then the deflecting torque on the magnet is,
Important Derivations to Revise from 12th Physics Chapter 5
From Magnetism And Matter Class 12 Important Questions, revise:
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Magnetic field due to a bar magnet (on axial line).
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Magnetic field due to a bar magnet (on equatorial line).
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Expression for torque on a magnetic dipole in a uniform magnetic field.
Stepwise presentation and neat diagrams are important in derivations.
Quick Revision Strategy for 12th Physics Chapter 5
To prepare efficiently:
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Revise all key definitions and differences.
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Practice neat diagrams of magnetic field lines.
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Memorize formulas related to magnetic dipole moment.
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Solve previous year board questions.
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Focus on Important Questions for Class 12 Physics Chapter 5 instead of reading the full chapter again.