Bar Magnet as an Equivalent Solenoid - Magnetism || Class 12 Physics Notes
Bar Magnet as an Equivalent Solenoid In solenoid each turn behaves as a small magnetic dipole having dipole moment $\mathrm{I} \mathrm{A}$. A solenoid is treated as arrangement of small magnetic dipoles placed in line with each other. The number of dipoles is equal to number of turns in a solenoid. The south and north poles of each turn cancel each other except the ends. So solenoid can be replaced by single south and north pole separated by distance equal to length of solenoid. The magnetic fie...
Read More →Cause of Earth Magnetism - Earth's Magnetism || Class 12 Physics Notes
Cause of Earth Magnetism Sir William Gilbert first suggested the existence of a powerful magnet inside the earth. This is not possible because. (a) Temperature inside earth is so high that it will not be possible for magnet to retain magnetism. (b) If there was a magnet inside the earth then position of earth's magnetic poles would have not changed. (c) The process of magnetization of this magnet is not understood. Grover suggested that earth's magnetism is due to flow of current near outer surf...
Read More →Terrestrial Magnetism - Earth's Magnetism || Class 12 Physics Notes
Do you know that the Earth is also a magnet? Yes!!! How do you think then that the suspended bar magnet always points in the north-south direction? Adware about the concept of the Terrestrial Magnetism that we are going to discuss in this chapter. It is really interesting to study and analyze this concept of earth’s magnetism. The branch of Physics which deals with the study of earth's magnetic field is called terrestrial magnetism. William Gilbert suggested that earth itself behaves like a huge...
Read More →Magnetic Elements - Magnetism Class 12 || Physics Notes
The physical quantities which determine the intensity of earth's total magnetic field completely both in magnitude and direction are called magnetic elements. Angle of Declination $(\phi)$: The angle between the magnetic meridian and geographic meridian at a place is called angle of declination. (a) Isogonic Lines : Lines drawn on a map through places that have same declination are called isogonic lines. (b) Agonic Line : The line drawn on a map through places that have zero declination is known...
Read More →Bohr Magneton: Unit of Bohr Magneton - Magnetism || Class 12 Physics Notes
Bohr Magneton is defined as the magnetic dipole moment associated with an atom due to orbital motion of an electron in the first orbit of hydrogen atom. This is the smallest value of magnetic moment. Unit of Bohr Magneton is- In CGS units it is defined by the equation: $\mu \mathrm{B}=(e \cdot h) / 2 m_{\mathrm{e}} \mathrm{c}$ In SI units it is defined by the equation: $\mu_{\mathrm{B}}=e \cdot h / 2 m_{e}$ The electron possesses magnetic moment due to its spin motion also $\overrightarrow{ M }_...
Read More →Current loop as a Magnetic Dipole - Magnetism | Class 12th Physics Notes
Current loop as a Magnetic Dipole Ampere found that the distribution of magnetic lines of force around a finite current-carrying solenoid is similar to that produced by a bar magnet. This is evident from the fact that a compass needle when moved around these two bodies shows similar deflections. After noting the close resemblance between these two, Ampere demonstrated that a simple current loop behaves like a bar magnet and put forward that all the magnetic phenomena are due to circulating elect...
Read More →Class 12 Magnetism - Gauss Law Definition || Solved Examples
As you know that the science is filled with fun facts. The deeper one dives into the concepts of science and its related fields, the greater amount of knowledge and information there is to learn in there. One such topic of study is the Gauss Law, which studies electric Charge along with a surface and the topic of Electric Flux. Let us study about the Gauss Law definition , Formula, Solved Examples in this Article,. Gauss’s law states that the net flux of an Electric Field in a closed surface is ...
Read More →Potential Energy of Magnetic Dipole in Magnetic Field || Magnetism Class 12 Physics Notes
Potential Energy of magnetic dipole in a magnetic field is defined as the amount of work done in rotating the dipole from zero potential energy position to any desired position. A current loop does not experience a net force in a magnetic field. It, however, experiences a torque. This is very similar to the behavior of an electric dipole in an electric field. A current loop, therefore, behaves like a magnetic dipole. India's Best Exam Preparation for Class 12th - Download Now Potential Energy of...
Read More →Torque on a Bar Magnet in a Magnetic Field || Class 12 Physics Notes
Here we will study about the Torque on a Bar Magnet in a Magnetic Field and Important Points related to it. When a bar magnet is placed in a uniform magnetic field the two poles experience a force. The forces are equal in magnitude and opposite in direction and do not have same line of action. They constitute a couple of forces which produces a torque. The torque tries to rotate the magnet so as to align it parallel to direction of field. Net force on bar magnet = $mB \hat{ i }+ mB (-\hat{ i })=...
Read More →Magnetic Field due to a Short Bar Magnet | Magnetic Dipole - Class 12 physics Notes
eSaral Class 12 Magnetic Field due to a Short Bar Magnet 🚀 Checkout eSaral Courses The magnetic field due to a short bar magnet at any point on the axial line is twice the magnetic field at a point on the equatorial line of that magnet at the same distance. S.l. unit of torque acting on the bar magnet is Nm. Magnetic field due to a short bar magnet (magnetic dipole) : On Axial Point or End on Position On Equatorial Point or Broadside Position At An Arbitrary Point On Axial Point or End on Positi...
Read More →Mind Maps for Rotational Motion: CRTM Revision - Class XI, JEE, NEET
Rotational Motion Class 11 comprises variety of cases with important formulae and key points. So here is the mind map to help you in remembering all the key formulae and important concepts on finger tips. Download...
Read More →Sample Papers Class 12 CBSE 2020 || All Subjects - Download PDF
CBSE Sample Papers for March 2020 Exams has been recently released by the Central Board of Secondary Education. Sample Papers Class 12 CBSE 2020 are given to download in PDF form. CBSE Class 12 Marking Scheme 2020 for these Sample Papers is also available in this article for download in PDF format. These CBSE Sample Papers 2020 are based on updated format of CBSE Class 12 Question Papers and are very important for the preparation of upcoming CBSE Board Exam 2020. Sample Papers Marking Scheme SUB...
Read More →JEE Advanced Previous Year Question Papers - Download PDF
If you want to get a good rank in JEE Advanced then it is very important for you to solve JEE Advanced previous year question Papers. When you solve previous year question papers of JEE Advanced then you will get the idea about the Important Topics, Exam pattern, and many different things that are important to know before writing the Actual JEE Advanced Exam. Aspirants who are willing to clear Joint Entrance Examination JEE have to solve Previous Year question Paper of Both JEE Main Advanced. He...
Read More →Detailed Syllabus of JEE Advanced 2020
IIT Delhi has released the detailed syllabus of JEE Advanced 2020 along with the official notification. JEE Advanced 2020 syllabus will be highly beneficial for candidates who are preparing for the upcoming entrance examination. This is because the detailed JEE Advanced syllabus will help candidates to ensure that they are not missing any important topic to cover. JEE Advanced 2020 syllabus consists of sections with their detailed topics for Physics, Chemistry, and Mathematics. JEE Advanced will...
Read More →Mind Map For Aromatic Hydrocarbons [Arenes] for Class 11, JEE & NEET - Download from here
Get to learn all important points and reactions of Aromatic Hydrocarbons through these mind map. Download and share with your friends also. Download Mind Map 1 Download Mind Map 2...
Read More →Important Formulas of Mathematics Class 10 | NCERT Chapter 11-15 | Download Mind Map
Mind Map covering Important Formulas of Maths Class 10 will help you to learn all the important and key formulae on Fingertips. The given Mind Map covering Following Chapters from Class 10 NCERT: - Constructions - Area Related to Circles - Surface Area and Volumes - Statistics - Probability MIND MAP 1 Download Mind Map 1 MIND MAP 2 Download Mind Map 2...
Read More →Magnetic Field | Properties of Magnetic Lines of Force Class 12, JEE
Magnetic Field The space around a magnet (or a current-carrying conductor) in which its magnetic effect can be experienced. Magnetic Lines of Force can be defined as curved lines used to represent a magnetic field, drawn such that the number of lines relates to the magnetic field’s strength at a given point and the tangent of any curve at a particular point is along the direction of the magnetic force at that point. The Properties of Magnetic Lines of Force are also discussed. Magnetic Field: Ma...
Read More →Magnetic Dipole Moment Formula – Definition & Solved Examples
eSaralClass 12 Physics Magnetic Dipole Moment Formula Definition Solved Examples Magnetic dipole moment formula: For a bar magnet, M = m(2ℓ), where m is the pole strength and 2ℓ is the magnetic length. For a current-carrying loop, M = NIA, where N is the number of turns, I is the current, and A is the area of the loop. Magnetic dipole moment is a vector quantity, measured in Am, directed from the south pole to the north pole (or given by the right-hand rule for a current loop). A magnetic moment...
Read More →Coulomb's law of Magnetism || Magnetism and Matter Class 12, JEE & NEET
Magnetism and Matter Class 12 Notes will help you in your Exam Preparation and will also help in scoring good! The property of any object by virtue of which it can attract a piece of iron or steel is called Magnetism. Here we will study about the Coulomb's Law in Magnetism, Magnetic Flux Density, and Pole Strength. Coulomb's Law in Magnetism Magnetic Flux Density Pole Strength Coulomb's Law in Magnetism If two magnetic poles of strengths ${{m_1}}$ and ${{m_2}}$ are kept at a distance r apart the...
Read More →ATOMIC THEORY OF MAGNETISM || Magnetism and Matter Class 12, JEE & NEET
Magnetism and Matter Class 12 Notes will help you in your Exam Preparation and will also help in scoring good! The property of any object by virtue of which it can attract a piece of iron or steel is called magnetism. Here will study about the Atomic Theory of Magnetism. Atomic Theory of Magnetism : Each atom behaves like a complete magnet having a north and south pole of equal strength. The electrons revolving around the nucleus in an atom are equivalent to small current loops which behave as a...
Read More →Properties of Bar Magnet || Magnetism and Matter Class 12, JEE & NEET
Playing with magnets is one of the first moments of science most children discover. That's because magnets are easy to use, safe, and fun. They're also quite surprising. Remember when you first discovered that two magnets could snap together and stick like glue? Remember the force when you held two magnets close and felt them either attract (pull toward one another) or repel (push away)? Here we will study about the Bar Magnet and Properties of Bar Magnet! Bar Magnet Bar Magnet Properties A bar ...
Read More →Magnetism and Matter Class 12 Notes - Introduction
Magnetism and Matter Class 12 Notes will help you in your Exam Preparation and will also help in scoring good! The property of any object by virtue of which it can attract a piece of iron or steel is called magnetism. Natural Magnet A natural magnet is an ore of iron (Fe3O4), which attracts small pieces of iron, cobalt and nickel towards it. Magnetite or lode stone is a natural magnet. Artificial Magnet A magnet which is prepared artificially is called an artificial magnet, e.g., a bar magnet, a...
Read More →Limitations of Cyclotron || Moving Charges and Magnetism Class 12, JEE & NEET
Here are some of the Limitations of Cyclotron listed below: When a charged particle is accelerated, its mass also starts increasing with increase in its speed. When its speed become comparable to that of light, the mass of the charged particle become quite large as compared to its rest mass. If $\mathrm{m}_{0}$ = rest mass, mass of charged particle moving with speed $v$ is $\quad m=\frac{m_{0}}{\sqrt{1-\frac{v^{2}}{c^{2}}}}$ Substituting for $\mathrm{m}$ in equation, we have time spent inside a ...
Read More →Construction and Working Principle of Cyclotron Class 12 Physics
We will study here about the Construction and Working Principle of Cyclotron Class 12 Working Principle of Cyclotron Construction of Cyclotron Cyclotron Introduction A cyclotron is used for accelerating positive ions so that they acquire energy large enough to carry out nuclear reactions. Cyclotron was designed by Lawrence and Livingstone in 1931. In a cyclotron, the positive ions cross again and again the same alternating (radio frequency) electric field. And gain the energy each time = q V. q ...
Read More →Cyclotron Working Principle, Applications & Frequency || Class 12 Physics Notes
The cyclotron frequency (or, equivalently, gyro-frequency) is the number of cycles a particle completes around its circular circuit every second. Cyclotron Frequency Under the action of the given magnetic field (B fixed), the given positive ion (e/m fixed) will cover the semi-circular path in a fixed time only, if t in equation is equal to $\frac{T}{2}$ Where T is the time period of the electric field. Maximum energy of the positive ions Maximum energy acquired by positive ions depends on the ra...
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