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JEE-Main - Grade 12 - Physics - Dual Nature of Radiation and Matter - Introduction and Snapshot of Dual Nature of Radiation and Matter - Study ref# 836

Introduction: The Maxwell’s equations of electromagnetism and Hertz experiments on the generation and detection of electromagnetic waves in 1887 strongly established the wave nature of light. Towards the same period at the end of 19th ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Introduction and Snapshot of Magnetism and Matter - Study ref# 818

Introduction: Magnetic phenomena are universal in nature. Vast, distant galaxies, the tiny invisible atoms, men and beasts all are permeated through and through with a host of magnetic fields from a variety of sources. The earth’s magn... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Introduction and Snapshot of Magnetism and Matter - Study ref# 819

Following sections must be covered to understand the Magnetism and Matter: 1. Introduction 2. The Bar Magnet 3. Magnetism and Gauss’s Law 4. The Earth’s Magnetism 5. Magnetisation and Magnetic Intensity 6. Magnetic Properties ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Target Setup for Magnetism and Matter - Study ref# 820

Student requires to achieve the following milestones to get better grip over Magnetism and Matter. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Te... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10517

A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field. Answer: The three independent quantities required to specify the earth’s magnetic field a... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10518

The angle of dip at a location in southern India is about 18°. Would you expect a greater or smaller dip angle in Britain? Answer: We can expect a greater value of angle of dip in Britain because Britain is located close to north pole. The ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10519

The earth’s field, it is claimed, roughly approximates the field due to a dipole of magnetic moment  located at its center. Check the order of magnitude of this number in some way. Answer: Dipole of magnetic moment M =. Now, we calculate the... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10520

Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth’s surface oriented in different directions. How is such a thing possible at all? Answer: The earth’s magnetic field is only due to the dipo... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10521

The earth’s magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably? Answer: Yes, the earth’s magnetic field varies from point to point in space and it also chan... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10522

The earth’s core is known to contain iron. Yet geologies do not regard this as a source of the earth’s magnetism. Why? Answer: The earth’s core contains iron but in the molten state. The molten iron is not ferromagnetic material in nature th... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10523

The earth’s field departs from its dipole shape substantially at large distance (greater than about 30000 km). What agencies may be responsible for this distortion? Answer: The responsible reason for this distortion may be the motion of iron... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10524

A short bar magnet of magnetic momentum m= 0.32 J/T is placed in a uniform magnetic field of 0.15T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its (a) stable and (b) unstable equilibrium? Wh... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10525

A closely wound solenoid of 800 turns and area of cross-section  carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment? Answer: Given, number of turns n = 800 ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10526

A closely wound solenoid of 2000 turns and area of cross-section  , carrying a current of 4.0A, is suspended through its center allowing it to turn in a horizontal plane. (a) What is the magnetic moment associated with the solenoi... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10527

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 22° with the horizontal. The horizontal component of the earth’s magnetic field at the place is known to be 0.35G. ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10528

A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the center of the magnet. The earth’s magnetic field at the place is... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10529

A magnetic dipole is under the influence of two magnetic fields. The angle between the field direction is 60° and one of the fields has a magnitude of  . If the dipole comes to sta... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10530

Why does a paramagnetic sample display greater magnetization (for the same magnetizing field) when cooled? Answer: A paramagnetic sample displays greater magnetisation when cooled because at the lower temperatures, the tendency to disrupt th... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10531

Why is diamagnetism, in contrast, almost independent of temperature? Answer: In a sample of diamagnetic substance, each molecule is not a magnetic dipole itself. So, the random thermal motion of the molecules does not affect the magnetism of... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10532

If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty? Answer: Bismuth is a diamagnetic element, so the magnetic field in the core will be slightly less than wh... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10533

Would the maximum possible magnetization of a paramagnetic sample be of the same order of magnitude as the magnetization of a ferromagnet? Answer: Yes, the maximum possible magnetization of a paramagnetic sample will be of the same order of ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10534

Explain qualitatively on the basis of domain picture the irreversibility in the magnetization curve of a ferromagnet. Answer: To explain qualitatively the domain picture of the irreversibility in the magnetization curve of a ferromagnet, ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10535

The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetization, which piece will dissipate greater heat energy? Answer: As we know that in... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10536

‘A system displaying hysteresis loop such as a ferromagnet, is a device for storing memory?’ Explain the meaning of this statement. Answer: The  magnetization of a ferromagnet depends not only on the magnetizing field, but also on the histor... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10537

What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player or for building ‘memory stores’ in a modern computer? Answer: The ferromagnetic materials which are used for coating magnetic tapes in a cassette pla... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10538

A compass needle free to turn in a horizontal plane is placed at the center of circular coil of 30 turns and radius 12 cm. The coil is in a vertical plane making an angle of 45° with the magnetic meridian. When the current in the coil is... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10539

A Rowland ring of mean radius 15cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetizing current of 1.2A? Answer: Given, radius of Rowland ring r = 15cm ... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10540

A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of materials? Answer: As we know that the magnetic moment of electron or proton is inversely proportional to mass of electron or proto... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10541

A bar magnet of magnetic moment m and moment of inertia I(about center, perpendicular to length) is cut into two equal pieces, perpendicular to length. Let T be the period of oscillations of the original magnet about an axis through the mid-... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10542

Assume the dipole model for earth’s magnetic field B which is given by  = Vertical component of magnetic field =   Horizo... read more

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