DAY 3 OF 90 DAYS REVISION FOR CLASS 12 PHYSICS CBSE BOARD BY SUNIDHI RAJPAL

Join our 90 day revision for class 12th CBSE Physics board exam.
DAY 3-
In this video, we will be discussing 5 questions for class 12th CBSE physics board exam.
Join our 90 day revision for class 12th CBSE Physics board exam.
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• DAY 1 OF 90 DAYS REVIS...
Link for the Day 2 -
• DAY 2 OF 90 DAYS REVIS...
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Chapter 1: Electric Charges and Fields
Electric Charges −
Conservation of charge
Coulomb’s law-force between two point charges
Forces between multiple charges
Superposition principle
Continuous charge distribution
Electric field, electric field due to a point charge, electric field lines, electric dipole, electric field due to a dipole, torque on a dipole in uniform electric field.
Electric flux, statement of Gauss’s theorem and its applications to find field due to infinitely long straight wire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell (field inside and outside).
Chapter-2: Electrostatic Potential and Capacitance
Electric potential, potential difference, electric potential due to a point charge, a dipole and system of charges
Equipotential surfaces, electrical potential energy of a system of two point charges and of electric dipole in an electrostatic field
Conductors and insulators, free charges and bound charges inside a conductor
Dielectrics and electric polarisation, capacitors and capacitance, combination of capacitors in series and in parallel, capacitance of a parallel plate capacitor with and without dielectric medium between the plates, energy stored in a capacitor.
Unit II: Current Electricity
Chapter 3: Current Electricity
Electric current, flow of electric charges in a metallic conductor, drift velocity, mobility and their relation with electric current
Ohm’s law, electrical resistance, V-I characteristics (linear and non-linear), electrical energy and power, electrical resistivity and conductivity
Carbon resistors, colour code for carbon resistors; series and parallel combinations of resistors; temperature dependence of resistance
Internal resistance of a cell, potential difference and EMF of a cell, combination of cells in series and in parallel
Kirchhoff’s laws and simple applications
Wheatstone bridge, metre bridge
Potentiometer −
Principle and its applications to measure potential difference and for comparing EMF of two cells
Unit III: Magnetic Effects of Current and Magnetism
Chapter 4: Moving Charges and Magnetism
Concept of magnetic field −
Oersted’s experiment
Biot - Savart law and its application to current carrying circular loop
Ampere’s law and its applications to infinitely long straight wire
Straight and toroidal solenoids
Force on a moving charge in uniform magnetic and electric fields
Cyclotron
Force on a current-carrying conductor in a uniform magnetic field
Force between two parallel current-carrying conductors-definition of ampere
Torque experienced by a current loop in uniform magnetic field; moving coil galvanometer-its current sensitivity and conversion to ammeter and voltmeter.
Chapter 5: Magnetism and Matter
Current loop as a magnetic dipole and its magnetic dipole moment
Magnetic dipole moment of a revolving electron
Magnetic field intensity due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis
Torque on a magnetic dipole (bar magnet) in a uniform magnetic field −
Bar magnet as an equivalent solenoid
Magnetic field lines
Earth’s magnetic field
Magnetic elements
Para-, dia- and ferro - magnetic substances, with examples
Electromagnets and factors affecting their strengths
Permanent magnets
Unit IV: Electromagnetic Induction and Alternating Currents
Chapter 6: Electromagnetic Induction
Electromagnetic induction −
Faraday’s laws
Induced EMF and current
Lenz’s Law
Eddy currents
Self and mutual induction.
Chapter 7: Alternating Current
Alternating currents −
Peak and RMS value of alternating current/voltage
Reactance and impedance
LC oscillations (qualitative treatment only)
LCR series circuit
Resonance
Power in AC circuits
Wattless current
AC generator and transformer
Measurement of internal resistance of a cell

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