Electric Dipole An electric dipole is a system consisting of two electric charges of equal magnitude but opposite sign that are separated by a distance. The product of positive charge and the separation between the charges is referred to as the dipole moment, which is a vector quantity pointing from the negative charge to the … Read more
Electric Field An electric field is a vector field that describes the force exerted by a charged object on other charged objects in its vicinity. It is a fundamental concept in electromagnetism and is essential for understanding the behavior of electrically charged particles and systems. The electric field at a given point in space is … Read more
Principle of superposition of electrostatic forces. Coulomb’s law gives force between two point charges. The principle of superposition enables us to find the force on a point charge due to a group of point charges. This principle is based on the property that the forces with which two charges attract or repel each other are … Read more
Coulomb’s Law Coulomb’s law, named after French physicist Charles-Augustin de Coulomb, describes the electrostatic interaction between two electrically charged particles. The law states that the magnitude of the electrostatic force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Mathematically, … Read more
Important Derivations for Class 12 Physics Chapter 4 Moving Charges and Magnetism Here we are providing important derivations for Class 12 Physics Chapter 4 Moving Charges and Magnetism. (1) Biot Savarts Law With the help of experimental results, Biot and Savart arrived at a mathematical expression that givesthe magnetic field at some point in space … Read more
[PDF] Download Important Diagrams for CBSE Class 12 Physics Here we are providing Important Diagrams for CBSE Class 12 Physics. All the important diagrams related to CBSE Class 12 Physics are covered in this article. Students are suggested to go through all these important diagrams before their exam. This is very useful for last minute … Read more
Important Derivations for Class 12 Physics Chapter 3 Current Electricity Deduction of Ohm’s law. When a potential difference ‘V’ is applied across a conductor of length ‘l’, the drift velocity in terms of ‘V’ is given by $$ v_d=\frac{e E \tau}{m}=\frac{e V \tau}{m l} $$ If the area of cross-section of the conductor is ‘A’ … Read more
Important Derivations for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance Derivations Related to Potential due to an Electric Dipole Derivation 1: Electric potential due to electric dipole at a point on its axial line. Solution: Let ‘P’ be an axial point at distance ‘r’ from the centre of the dipole. Electric potential at … Read more
Important Derivations for Class 12 Physics Chapter 7 Alternating Current Derivations Related to A.C. Applied Across an Inductor Derivation 1: (1) An ac voltage, V = V0 sin wt, is applied across a pure inductor L. Obtain an expression for the current I in the circuit and hence obtain the(i) inductive reactance of the circuit, … Read more
Important Derivations for Class 12 Physics Chapter 1 Electric Charges and Fields Q.1. Using Gauss’s law, prove that the electric field at a point due to a uniformly charged infinite plane sheet is independent of the distance from it. Solution: Q.2. Derive an expression for the torque experienced by an electric dipole kept in a … Read more
Revision Notes for Class 12 Physics Chapter 12 Atoms Thomson’s model of atom: It was proposed by J. J. Thomson in 1898. According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it like seeds in a watermelon. … Read more
Important Derivations for Class 12 Physics Chapter 10 Wave Optics Derivations related to Huygens’ Principle (1) Using Huygens’ principle, verify the laws of reflection at a plane surface. First the wavefront touches the reflecting surface at B and then at the successive points towards C. In accordance with Huygens’ principle, from each point on BC … Read more
Conceptual Questions Based on Class 12 Physics Nuclei Here we are providing conceptual questions based on Class 12 Physics Nuclei. Students are suggested to go through each and every question for better understanding. Q.1. What is the ratio of the nuclear densities of two nuclei having mass numbers in the ratio 1:4? Solution. As the … Read more
Conceptual Questions Based on Class 12 Physics Atoms Here we are providing conceptual questions for Class 12 Physics Chapter 12 Atoms. Students should go through each and every question for better understanding. Q.1. The large angle scattering is possible only due to nucleus. Why? Solution, α-particles can be scattered through large angles only if they … Read more
Conceptual Questions Based on Class 12 Physics Dual Nature of Radiation and Matter Q.1. What happens to the wavelength of a photon after it collides with an electron? Solution. A photon transfers a part of its energy to the colliding electron, so its energy decreases and consequently wavelength increases. Q.2. Why are alkali metals most … Read more
Conceptual Questions Based on Class 12 Physics Wave Optics Here we are providing conceptual questions based on Class 12 Physics Wave Optics. Go through each and every question for better understanding. Q.1. What are the reasons to believe that light is a wave motion? Solution. Light undergoes interference, diffraction and polarization. These phenomena establish that … Read more
Conceptual Questions Based on Class 12 Physics Optical Instruments Here we are providing conceptual questions based on class 12 physics chapter 9 Optical Instruments. These questions are prepared by experts and are very useful from exam point of view. Students can practice these questions for scoring better marks in the exam. Q.1. How will the … Read more
Conceptual Questions Based on Class 12 Physics Ray Optics Here we are providing conceptual questions based on class 12 physics chapter 9 Ray Optics. These questions are prepared by experts and are very useful from exam point of view. Students can practice these questions for scoring better marks in the exam. Q.1. Why is a … Read more
Here we are providing revision notes for class 12 physics chapter 7 alternating current. Students can use this article for quick revision of the chapter. Revision Notes for Class 12 Physics Chapter 7 Alternating Current 1. Alternating current. It is that current which varies in magnitude continuously and reverses its direction periodically. Its value at … Read more
Here we are providing extra questions for class 12 physics. In this article we have covered class 12 physics chapter 10 Wave Optics. Different kind of questions are included to give students an idea about every possible question related to the chapter. Extra Questions for Class 12 Physics Chapter 10 Wave Optics Very Short Answer … Read more
Here we are providing extra questions for class 12 physics. In this article we have covered class 12 physics chapter 9 Ray optics and Optical Instrument. Different kind of questions are included to give students an idea about every possible question related to the chapter. Extra Questions for Class 12 Physics Chapter 9 Ray Optics … Read more
Numerical Problems on Total Internal Reflection and Critical Angle Class 12 Physics · Ray Optics and Optical Instruments Here we are providing numerical problems based on topic total internal reflection and critical angle for class 12 physics. SQ Total Internal Reflection Practice Set Apply Snell’s Law and the Critical Angle formula $\sin C = \frac{\mu_{rarer}}{\mu_{denser}}$ … Read more
Numerical Problems Based on Refraction of Light for Class 12 Physics Here we are providing numerical problems based on refraction of light for class 12 physics. This covers problems on lateral shift, real and apparent depth. Students can practice these questions for better understanding of the concepts and formulae. Q.1. A ray of light of … Read more
Here we are providing Numerical Problems based on Mirror Formula for CBSE Class 12 Physics. Numerical Problems on Mirror Formula Class 12 Physics · Ray Optics N Mirror Formula Practice Set 1 Apply $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$ and $m = -\frac{v}{u}$ Ch 9 · Ray Optics 1 A 5 cm long needle is placed … Read more
Here we are providing conceptual questions based on class 12 physics chapter 8 electromagnetic waves. These questions are prepared by experts and are very useful from exam point of view. Students can practice these questions for scoring better marks in the exam. Conceptual Questions Based on Class 12 Physics Electromagnetic Waves Q.1. What is displacement … Read more
Conceptual Questions Based on Class 12 Physics Magnetism and Matter Q.1. Does a magnetic monopole exist? Justify your answer. How magnetic field is produced? Solution. No, a magnetic monopole does not exist. The reason is that a magnetic field is produced by a current loop and not by monopole of a magnet. Q.2. How does … Read more
Conceptual Questions Based on Alternating Current Q.1. Why a d.c. voltmeter and d.c. ammeter cannot read a.c.? Solution. The average value of a.c. over a cycle is zero. So, a d.c. voltmeter/ammeter will show zero reading with alternating voltage/current. Q.2. What is meant by the statement that the current through an inductor lags behind the … Read more
Q.1. Will an induced emf develop in a conductor, when moved in a direction parallel to the magnetic field ? Solution. No, because the magnetic flux linked with the conductor does not change when it is moved parallel to the magnetic field. Moreover, the magnetic Lorentz force on the free electrons of the conductor is … Read more
Conceptual Questions Based on Moving Charges and Magnetism Here we are providing conceptual questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism. Q.1. How is a magnetic field produced ?Sol. A magnetic field can be produced by the following ways: (i) by a magnet (ii) by a current carrying conductor (iii) by a … Read more
Here we are providing topicwise important questions with answers for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance. Study notes of topics covered are also provided so that you can revise at the same time before doing the question answer. Topicwise Important Questions and Answers for Class 12 Physics Chapter 2 Chapter: Electrostatic Potential … Read more
