SAMPLE PAPER 2025 SOLVED - DAY 11 OF 90 DAYS REVISION FOR CLASS 12 PHYSICS

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In this video, we will be discussing the most important questions for class 12th CBSE physics board exam.


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Chapter 1: Electric Charges and Fields

Electric Charges −
Conservation of charge
Coulomb’s law-force between two point charges


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

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
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

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

Ray Optics
Wave Optics
Dual nature of matter and radiation
EM waves
Atoms
Nuclei
Semiconductor Devices