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H.C. Verma solutions for Class 12 Physics chapter 15 - Magnetic Properties of Matter

Concepts of Physics - Vol. 2

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H.C. Verma Concepts of Physics - Vol. 2

Concepts of Physics - Vol. 2 - Shaalaa.com

Chapter 15: Magnetic Properties of Matter

Short AnswersMCQOthers

Chapter 15: Magnetic Properties of Matter Exercise Short Answers solutions [Page 285]

Short Answers | Q 1 | Page 285

When a dielectric is placed in an electric field, it gets polarised. The electric field in a polarised material is less than the applied field. When a paramagnetic substance is kept in a magnetic field, the field in the substance is more than the applied field. Explain the reason of this opposite behaviour.

Short Answers | Q 2 | Page 285

The property of diamagnetism is said to be present in all materials. Then, why are some materials paramagnetic or ferromagnetic?

Short Answers | Q 3 | Page 285

Do permeability and relative permeability have the same dimensions?

Short Answers | Q 4 | Page 285

A rod, when suspended in a magnetic field, stays in the east-west direction. Can we be sure that the field is in the east-west direction? Can it be in the north-south direction?

Short Answers | Q 5 | Page 285

Why is it not possible to make permanent magnets from paramagnetic materials?

Short Answers | Q 6 | Page 285

Can we have magnetic hysteresis in paramagnetic or diamagnetic substances?

Short Answers | Q 7 | Page 285

When a ferromagnetic material goes through a hysteresis loop, its thermal energy is increased. Where does this energy come from?

Short Answers | Q 8 | Page 285

What are the advantages of using soft iron as a core, instead of steel, in the coils of galvanometers?

Short Answers | Q 9 | Page 285

To keep valuable instruments away from the earth's magnetic field, they are enclosed in iron boxes. Explain.

Chapter 15: Magnetic Properties of Matter Exercise MCQ solutions [Pages 285 - 286]

MCQ | Q 1 | Page 285

A paramagnetic material is placed in a magnetic field. Consider the following statements:-
(A) If the magnetic field is increased, the magnetisation is increased.
(B) If the temperature is increased, the magnetisation is increased.

  • A and B are true.

  • A is true but B is false.

  • B is true but A is false.

  • A and B are false.

MCQ | Q 2 | Page 286

A paramagnetic material is kept in a magnetic field. The field is increased till the magnetisation becomes constant. If the temperature is now decreased, the magnetisation ___________ .

  • will increase

  • will decrease

  • will remain constant

  • may increase or decrease

MCQ | Q 3 | Page 286

A ferromagnetic material is placed in an external magnetic field. The magnetic domains ______________ .

  • increase in size

  • decrease in size

  • may increase or decrease in size

  • have no relation with the field

MCQ | Q 4 | Page 286

A long, straight wire carries a current i. The magnetising field intensity H is measured at a point P close to the wire. A long, cylindrical iron rod is brought close to the wire, so that the point P is at the centre of the rod. The value of H at P will ______________ .

  • increase many times

  • decrease many times

  • remain almost constant

  • become zero

MCQ | Q 5 | Page 286

The magnetic susceptibility is negative for _____________ .

  • paramagnetic materials only

  • diamagnetic materials only

  • ferromagnetic materials only

  • paramagnetic and ferromagnetic materials

MCQ | Q 6 | Page 286

The desirable properties for making permanent magnets are _________________ .

  • high retentivity and high coercive force

  • high retentivity and low coercive force

  • low retentivity and high coercive force

  • low retentivity and low coercive force

MCQ | Q 7 | Page 286

Electromagnets are made of soft iron because soft iron has _______________ .

  • high retentivity and high coercive force

  • high retentivity and low coercive force

  • low retentivity and high coercive force

  • low retentivity and low coercive force

Chapter 15: Magnetic Properties of Matter Exercise MCQ solutions [Page 286]

MCQ | Q 1 | Page 286

Pick the correct options.
(a) All electrons have magnetic moment.
(b) All protons have magnetic moment.
(c) All nuclei have magnetic moment.
(d) All atoms have magnetic moment.

MCQ | Q 2 | Page 286

The permanent magnetic moment of the atoms of a material is not zero. The material ________________ .

  • must be paramagnetic

  • must be diamagnetic

  • must be ferromagnetic

  • may be paramagnetic

MCQ | Q 3 | Page 286

The permanent magnetic moment of the atoms of a material is zero. The material _________________ .

  • must be paramagnetic

  • must be diamagnetic

  • must be ferromagnetic

  • may be paramagnetic

MCQ | Q 4 | Page 286

Which of the following pairs has quantities of the same dimensions?
(a) Magnetic field B and magnetising field intensity H
(b) Magnetic field B and intensity of magnetisation I
(c) Magnetising field intensity H and intensity of magnetisation I
(d) Longitudinal strain and magnetic susceptibility

MCQ | Q 5 | Page 286

When a ferromagnetic material goes through a hysteresis loop, the magnetic susceptibility
(a) has a fixed value
(b) may be zero
(c) may be infinity
(d) may be negative

MCQ | Q 6 | Page 286

Mark out the correct options.
(a) Diamagnetism occurs in all materials.
(b) Diamagnetism results from the partial alignment of permanent magnetic moment.
(c) The magnetising field intensity, H, is always zero in free space.
(d) The magnetic field of induced magnetic moment is opposite the applied field.

Chapter 15: Magnetic Properties of Matter solutions [Pages 286 - 287]

Q 1 | Page 286

The magnetic intensity H at the centre of a long solenoid carrying a current of 2.0 A, is found to be 1500 A m−1. Find the number of turns per centimetre of the solenoid.

Q 2 | Page 286

A rod is inserted as the core in the current-carrying solenoid of the previous problem. (a) What is the magnetic intensity H at the centre? (b) If the magnetization I of the core is found to be 0.12 A m−1, find the susceptibility of the material of the rod. (c) Is the material paramagnetic, diamagnetic or ferromagnetic?

Q 3 | Page 286

The magnetic field inside a long solenoid of 50 turns cm−1 is increased from 2.5 × 10−3 T to 2.5 T when an iron core of cross-sectional area 4 cm2 is inserted into it. Find (a) the current in the solenoid (b) the magnetisation I of the core and (c) the pole strength developed in the core.

Q 4 | Page 286

A bar magnet of length 1 cm and cross-sectional area 1.0 cm2 produces a magnetic field of 1.5 × 10−4 T at a point in end-on position at a distance 15 cm away from the centre. (a) Find the magnetic moment M of the magnet. (b) Find the magnetisation I of the magnet. (c) Find the magnetic field B at the centre of the magnet.

Q 5 | Page 286

The susceptibility of annealed iron at saturation is 5500. Find the permeability of annealed iron at saturation.

Q 6 | Page 286

The magnetic field B and the magnetic intensity H in a material are found to be 1.6 T and 1000 A m−1, respectively. Calculate the relative permeability µr and the susceptibility χ of the material.

Q 7 | Page 287

The susceptibility of magnesium at 300 K is 1.2 × 10−5. At what temperature will the susceptibility increase to 1.8 × 10−5?

Q 8 | Page 287

Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magnetons (1 Bohr magneton equals 9.27 × 10−24 A m2). The density of atoms in iron is 8.52 × 1028 atoms m−3. (a) Find the maximum magnetisation I in a long cylinder of iron (b) Find the maximum magnetic field B on the axis inside the cylinder.

Q 9 | Page 287

The coercive force for a certain permanent magnet is 4.0 × 104 A m−1. This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetise it completely. Find the current.

Chapter 15: Magnetic Properties of Matter

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H.C. Verma Concepts of Physics - Vol. 2

Concepts of Physics - Vol. 2 - Shaalaa.com

H.C. Verma solutions for Class 12 Physics chapter 15 - Magnetic Properties of Matter

H.C. Verma solutions for Class 12 Physics chapter 15 (Magnetic Properties of Matter) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Concepts of Physics - Vol. 2 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. H.C. Verma textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 12 Physics chapter 15 Magnetic Properties of Matter are The Magnetic Dipole Moment of a Revolving Electron, Circular Current Loop as a Magnetic Dipole, Torque on a Rectangular Current Loop in a Uniform Magnetic Field, Magnetic Field on the Axis of a Circular Current Loop, Motion in a Magnetic Field, Velocity Selector, Solenoid and the Toroid - the Toroid, Solenoid and the Toroid - the Solenoid, Magnetic Diapole, Moving Coil Galvanometer, Torque on a Current Loop in Magnetic Field, Force Between Two Parallel Currents, the Ampere, Force on a Current - Carrying Conductor in a Uniform Magnetic Field, Cyclotron, Force on a Moving Charge in Uniform Magnetic and Electric Fields, Straight and Toroidal Solenoids (Only Qualitative Treatment), Ampere’s Circuital Law, Magnetic Field Due to a Current Element, Biot-Savart Law, Oersted’s Experiment, Magnetic Force, Magnetic Substances, Magnetic Dipole Moment of a Revolving Electron, Current Loop as a Magnetic Dipole and Its Magnetic Dipole Moment, Introduction of Magnetism, Magnetisation and Magnetic Intensity, Curie Law of Magnetism, Magnetism and Gauss’s Law, Hysteresis Loop, Permanent Magnets and Electromagnets, Magnetic Properties of Materials, The Earth’S Magnetism, The Bar Magnet, Torque on a Magnetic Dipole (Bar Magnet) in a Uniform Magnetic Field, Dipole in a Uniform External Field, Magnetic Field Intensity Due to a Magnetic Dipole (Bar Magnet) Perpendicular to Its Axis, Magnetic Field Intensity Due to a Magnetic Dipole (Bar Magnet) Along Its Axis.

Using H.C. Verma Class 12 solutions Magnetic Properties of Matter exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in H.C. Verma Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 12 prefer H.C. Verma Textbook Solutions to score more in exam.

Get the free view of chapter 15 Magnetic Properties of Matter Class 12 extra questions for Physics and can use Shaalaa.com to keep it handy for your exam preparation

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