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Class 12 Physics

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Class 12 Physics Video Lectures

  • Chapter 1 – Electric Charges and Field ( Part 1)
    25:16
  • Chapter 1 – Electric Charges and Field ( Part 1)
    41:05
  • Chapter 1 – Electric Charges and Field ( Part 2)
    41:05
  • Chapter 1 – Electric Charges and Field ( Part 3)
    28:54
  • Chapter 1 – Electric Charges and Field ( Part 4)
    00:00
  • Chapter 2- Electrical Potential and Capacitance ( Lecture 1)
    00:00
  • Chapter 2- Electrical Potential and Capacitance ( Lecture 2)
    00:00
  • Chapter 2- Electrical Potential and Capacitance ( Lecture 4)
    00:00
  • Chapter 2- Electrical Potential and Capacitance
    00:00
  • Chapter 3 : Current Electricity (Lecture 1)
    23:51
  • Chapter 3 : Current Electricity (Lecture 2)
    24:10
  • Chapter 5- Magnetism and Matter ( Part 1)
    00:00
  • Chapter 5- Magnetism and Matter ( Part 2)
    00:00
  • Chapter 5- Magnetism and Matter ( Part 3)
    00:00
  • Chapter 5- Magnetism and Matter ( Part 4)
    00:00
  • Chapter 7 – Alternating Current (Part 1)
    00:00
  • Chapter 7 – Alternating Current (Part 2)
    00:00
  • Chapter 7 – Alternating Current (Part 3)
    00:00
  • Chapter 7 – Alternating Current (Part 4)
    00:00
  • Chapter 7 – Alternating Current (Part 5)
    00:00
  • Chapter9 -Ray optics and optical instruments ( Part 1)
    00:00
  • Chapter9- Ray optics and optical instruments ( Part 2)
    25:31
  • Chapter9- Ray optics and optical instruments ( Part 3)
    00:00
  • Chapter9- Ray optics and optical instruments (Part 4)
    00:00
  • Chapter9- Ray optics and optical instruments ( Part 5)
    00:00
  • Chapter9- Ray optics and optical instrument (Part 6)
    00:00
  • Chapter9- Ray optics and optical instruments ( Part 7)
    00:00
  • Chapter10- Wave Optics ( Part 1)
    00:00
  • Chapter10- Wave Optics ( Part 2)
    00:00
  • Chapter10- Wave Optics ( Part 3)
    00:00
  • Chapter10- Wave Optics ( Part 4)
    00:00
  • Chapter10- Wave Optics ( Part 5)
    00:00
  • Chapter10- Wave Optics ( Part 6)
    00:00
  • Chapter10- Wave Optics ( Part 7)
    00:00
  • Chapter10- Wave Optics ( Part 8)
    00:00
  • Chapter10- Wave Optics ( Part 9)
    00:00
  • Chapter10- Wave Optics ( Part 10)
    00:00
  • Class 12 Physics: The Superposition of Electric Charge
    00:00
  • Class 12 Ch 3 Whetstone Bridge Principle Sidhartha Sir
    00:00
  • Class 12 Ch 4 Biot savarts LawMagnetic effect of current Sidhartha Lecture 1
    00:00
  • Class 12 Ch 4 Biot savarts LawMagnetic effect of current Sidhartha Lecture 3
    30:07

Exam notes for the NCERT Class 12 Physics Chapter on Electric Charges and Field
Exam notes for NCERT Class 12 Physics Chapter on "Electric Charges and Fields": **Chapter 1: Electric Charges and Fields** **Introduction:** - This chapter introduces the fundamental concepts of electric charges, the nature of electric charges, and electric fields. **Key Concepts:** **1. Electric Charges:** - Matter is composed of atoms, which consist of protons (positively charged), electrons (negatively charged), and neutrons (neutral). Protons and electrons carry equal and opposite charges. **2. Conservation of Charge:** - The total electric charge in a closed system remains constant. Charges are neither created nor destroyed; they can only be transferred. **3. Conductors and Insulators:** - Materials are classified as conductors (e.g., metals) and insulators (e.g., rubber) based on their ability to conduct electric charge. **4. Coulomb's Law:** - Coulomb's law describes the force of attraction or repulsion between two point charges. The force (F) is directly proportional to the product of the magnitudes of the charges (q1 and q2) and inversely proportional to the square of the distance (r) between them. **5. Electric Field:** - An electric field (E) is a region around a charge where another charge experiences a force. It is a vector quantity and is defined as the force per unit positive charge (E = F/q). **6. Electric Field Lines:** - Electric field lines represent the direction and intensity of the electric field. They originate from positive charges and terminate on negative charges. They never cross each other. **7. Electric Dipole:** - An electric dipole consists of two equal and opposite charges separated by a small distance. It has a characteristic electric field pattern. **8. Electric Flux:** - Electric flux (Φ) is a measure of the number of electric field lines passing through a given area. It depends on the angle between the field lines and the area vector. **9. Gauss's Law:** - Gauss's law relates the electric flux through a closed surface to the total charge enclosed within that surface. It provides a useful method for calculating electric fields in symmetric situations. **10. Applications of Gauss's Law:** - Gauss's law is applied to find the electric field due to various charge distributions, such as a uniformly charged spherical shell. **Summary:** - This chapter explores the properties of electric charges, the behavior of electric fields, and the relationship between charges and electric fields. - Coulomb's law, electric field lines, and Gauss's law are essential concepts for understanding the behavior of electric charges and fields. - The chapter lays the foundation for the study of electromagnetism and electric circuits in subsequent chapters. **Practice Problems:** 1. Calculate the force between two point charges of +3 μC and -4 μC separated by a distance of 10 cm. 2. Determine the electric field intensity at a point due to a charge of +5 μC located 15 cm away. 3. Find the electric flux through a closed surface containing a charge of +6 mC. 4. Use Gauss's law to find the electric field outside and inside a uniformly charged spherical shell. 5. Solve problems involving electric dipoles and their behavior in external electric fields.

Exam notes for the NCERT Class 12 Physics Chapter on Electric Charge and Electrostatic Potential
Exam notes for NCERT Class 12 Physics Chapter on "Electric Charge and Electrostatic Potential": **Chapter 2: Electric Charge and Electrostatic Potential** **Introduction:** - This chapter delves into the concepts of electric charge, conductors and insulators, Coulomb's law, electric potential, and potential due to a point charge. **Key Concepts:** **1. Electric Charge:** - Electric charge is a fundamental property of matter, carried by protons (positive charge) and electrons (negative charge). Like charges repel, while opposite charges attract. **2. Coulomb's Law:** - Coulomb's law describes the force of attraction or repulsion between two point charges. The force (F) is directly proportional to the product of the magnitudes of the charges (q1 and q2) and inversely proportional to the square of the distance (r) between them. **3. Electric Field:** - An electric field (E) is a region around a charge where another charge experiences a force. It is a vector quantity and is defined as the force per unit positive charge (E = F/q). **4. Electric Potential Energy:** - The electric potential energy (U) of a system of charges is the work done in assembling the system from infinity. It is given by U = (k * |q1 * q2|) / r, where k is Coulomb's constant. **5. Electric Potential (Voltage):** - Electric potential (V) at a point is the electric potential energy per unit positive charge. It is measured in volts (V) and is a scalar quantity. - Electric potential due to a point charge q at a distance r is V = (k * |q|) / r. **6. Potential Difference:** - The potential difference (VAB) between two points A and B is the work done in moving a positive test charge (q0) from A to B, divided by the charge (VAB = W/q0). **7. Equipotential Surface:** - An equipotential surface is a surface where the electric potential is the same at all points. No work is done in moving a charge on an equipotential surface. **8. Electric Dipole:** - An electric dipole consists of two equal and opposite charges (+q and -q) separated by a distance (2a). It has a characteristic electric potential and electric field pattern. **9. Torque on an Electric Dipole:** - An electric dipole placed in an external electric field experiences a torque (τ) that tends to align it with the field. The torque is given by τ = p * E * sin(θ), where p is the dipole moment and θ is the angle between p and E. **10. Work Done in Rotating an Electric Dipole:** - The work done in rotating an electric dipole from one stable equilibrium position to another is stored as its potential energy. **Summary:** - This chapter explores the concepts of electric charge, Coulomb's law, electric potential, and potential energy. - Understanding electric potential and potential difference is crucial for solving problems related to electric fields and circuits. - Electric dipoles and their behavior in external electric fields are studied in detail. - The chapter provides the foundation for understanding capacitance and capacitance-related phenomena. **Practice Problems:** 1. Calculate the electric field due to a point charge of +6 μC at a distance of 12 cm from the charge. 2. Determine the potential energy of two point charges of +2 μC and -3 μC separated by 8 cm. 3. Find the potential difference between two equipotential surfaces with values 100 V and 150 V. 4. Calculate the torque experienced by an electric dipole of moment 4 × 10^(-29) C·m in a uniform electric field of 10^5 N/C. 5. Solve problems involving the work done in rotating an electric dipole in an external electric field.

Exam notes for the NCERT Class 12 Physics Chapter on Current Electricity
Exam notes on the NCERT Class 12 Physics Chapter on Current Electricity: **Chapter Name: Current Electricity** **Introduction to Current Electricity:** - Electric Current: It is the rate of flow of electric charge through a conductor. - Electric Current is a scalar quantity, and its SI unit is the Ampere (A). **Electric Current and Drift Velocity:** - In a conductor, electric current is carried by free electrons. - The drift velocity of electrons is the average velocity with which electrons move in a conductor in the presence of an electric field. **Ohm's Law:** - Ohm's law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points. - Mathematically, Ohm's law is expressed as: V = IR, where V is voltage, I is current, and R is resistance. - The SI unit of resistance is the ohm (Ω). **Resistance and Resistivity:** - Resistance (R) depends on the material, length (L), and cross-sectional area (A) of a conductor and is given by R = ρ (resistivity) * (L / A). - Resistivity (ρ) is a property of the material and is measured in ohm-meter (Ω·m). **Factors Affecting Resistance:** - Length: Longer conductors have higher resistance. - Cross-Sectional Area: Wider conductors have lower resistance. - Temperature: Resistance increases with temperature in most materials. **Combination of Resistors:** - Resistors in series: The total resistance (R_total) in a series circuit is the sum of individual resistances (R_total = R1 + R2 + ...). - Resistors in parallel: The reciprocal of the total resistance (1 / R_total) in a parallel circuit is the sum of reciprocals of individual resistances (1 / R_total = 1 / R1 + 1 / R2 + ...). **Electric Power:** - Electric power (P) is the rate at which electric energy is consumed or produced. - Mathematically, power is given by P = VI, where V is voltage and I is current. - The SI unit of power is the watt (W). **Heating Effects of Electric Current:** - When an electric current flows through a resistor, it generates heat. - The heating effect is given by the formula: H = I²Rt, where H is the heat produced, I is current, R is resistance, and t is time. **Electric Circuits:** - Electric circuits consist of various components like resistors, capacitors, and batteries connected in specific ways to control the flow of electric current. - Series circuits have one path for current, while parallel circuits have multiple paths. - Kirchhoff's laws (Kirchhoff's current law and Kirchhoff's voltage law) are fundamental principles used to analyze complex circuits. **Electrical Instruments:** - Ammeter: Measures electric current in amperes. - Voltmeter: Measures electric potential difference (voltage) in volts. These notes cover the key concepts of the NCERT Class 12 Physics Chapter on Current Electricity. Studying this chapter thoroughly will provide you with a strong foundation in understanding electric circuits and current flow.

Exam notes for the NCERT Class 12 Physics Chapter 4: Moving Charges and Magnetism

Exam notes on NCERT Physics Class 12 Chapter 5: Magnetism and Matter
NCERT Physics Class 12 Chapter 4 covers the magnetic effect of the current, which includes Biot-Savart's Law. Here are some key points from this topic: Biot-Savart's Law: This law gives the magnetic field produced due to a small current element. It states that the differential magnetic field dBdB at a point due to the differential current element IdlIdl is directly proportional to the product of IdlIdl and the sine of the angle between dldl and rr, and inversely proportional to the square of the distance rr from the current element. Magnetic Field due to a Straight Conductor: The chapter explains how to calculate the magnetic field at a point due to a current-carrying straight conductor using Biot-Savart's Law. Magnetic Field on the Axis of a Circular Current Loop: The magnetic field at any point on the axis of a circular loop can be calculated using Biot-Savart's Law. Ampere’s Circuital Law: This law relates the integrated magnetic field around a closed loop to the electric current passing through the loop. Understanding these concepts involves grasping the mathematical derivations and the physical implications of these laws, as well as solving related problems to strengthen your comprehension. For detailed study, it's recommended to refer to the NCERT textbook and class notes.

Exam notes on NCERT Physics Class 12 Physics Chapter 6: Electromagnetic Induction

Exam notes on NCERT Physics Class 12 Physics: Chapter 7 – Alternating Current
Chapter 7 of NCERT Class 12 Physics, titled "Alternating Current," covers key concepts regarding AC circuits: Alternating Currents: Understanding what AC is and how it differs from direct current (DC). The basic definition includes the direction of current periodically reversing. AC Voltage Applied to a Resistor: Analysis of the behavior of a resistor in an AC circuit, including phase relationships between voltage and current. Representation of AC Current and Voltage by Rotating Vectors - Phasors. AC Voltage Applied to an Inductor and Capacitor: Understanding how inductors and capacitors behave in AC circuits, including the phase difference between voltage and current. AC Voltage Applied to a Series LCR Circuit: Analysis of a circuit containing a resistor (R), inductor (L), and capacitor (C) in series, including concepts like impedance and resonant frequency. Power in AC Circuits: The concept of power factor, real power, and reactive power in AC circuits. LCR Parallel Circuit: Understanding the behavior of LCR components in a parallel AC circuit. Resonance: Study of resonance in AC circuits and its applications. Transformers: Understanding the principle of operation, construction, and use of transformers in AC circuits. For exam preparation, focus on the derivations, numerical problems, and conceptual understanding of these topics.

Exam notes on NCERT Physics Class 12 Chapter 8: Electromagnetic Waves
Chapter 9 of NCERT Class 12 Physics, "Ray Optics and Optical Instruments," delves into the behavior of light in various mediums and the design of optical devices: Reflection and Refraction: Discusses the fundamental concepts of reflection and refraction, including the laws of reflection, Snell's Law, and critical angle. Spherical Mirrors: Explores image formation by concave and convex mirrors, mirror formula, and magnification. Refraction at Spherical Surfaces: Covers the refraction of light through spherical surfaces, deriving the lens maker’s formula, and explaining concepts like focal length and power of a lens. Thin Lens Formula: Introduces the concept of a thin lens and its application in the lens formula for image formation. Lens-Maker’s Formula: Describes how the focal length of a lens is related to the radii of curvature of its surfaces and the refractive index of the material. Magnification: Explains the magnification produced by lenses and mirrors, including its calculation and significance. Prisms: Detailed study of the refraction of light through a prism, angle of minimum deviation, and dispersion of light. Optical Instruments: Detailed explanation of how optical instruments like microscopes and telescopes work, including their construction, principle of operation, and image formation. Eye Defects and Corrections: Discusses common defects of vision and their corrections using lenses. Scattering of Light: Explores the phenomenon of light scattering and its applications, such as the blue color of the sky. For comprehensive exam preparation, it's crucial to understand these concepts thoroughly, practice numerical problems, and review derivations and diagrams. These form the basis of many questions in board exams and competitive tests.

Exam notes on NCERT Physics Class 12 Chapter 9: Ray Optics and Optical Instruments

Exam notes on NCERT Physics Class 12 Chapter 10: Wave Optics

Study notes on NCERT Physics Class 12 Chapter 11: Dual Nature of Radiation and Matter

Study notes on NCERT Physics Class 12 Chapter 12: Atoms

Study notes on NCERT Physics Class 12 Chapter 13: Nuclei

Study notes on NCERT Physics Class 12 Chapter 14: Semiconductor Electronics: Materials, Devices and Simple Circuits

Study notes on NCERT Physics Class 12 Chapter 15: Communication Systems

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