# Most Important Topics Of Physics For JEE Mains 2021

If You Are Preparing For JEE Mains 2021 Then This Post Will Be A Great Help For All JEE MAINS 2021 Aspirants. In This Post I Have Written About “Most Important Topics Of Physics For JEE Mains 2021”.

All Of You Know That In This I Am Writing About Most Important Topics. So I Have Written Most Important Topics Of Physics From Every Chapter.

So Let's Begin And Read This Complete Article Carefully.

 Motion in 1D ● Stopping distance● Equation of motion ● Free fall-two bodies at the same time ● Graphs

 Motion in 2D ● Projectile motion ● vectors

 Laws of motion ● String -block and pulley-block. ● Apparent weight inside a lift ● Equilibrium of a body ● Coefficient of friction ● Block on an inclined plane( most repeated) ● Block held stationary against a wall ● Problems are combined with rotational motion

 Elasticity ● Change in length of a wire due to stress ● Work done in stretching ● Problems from this section are generally combined with thermal expansion, SHM, waves on a string and mechanics ● Bulk modulus

 Thermal expansion ● Thermal stress( two rods fixed between rigid support then heated or cooled) ● Relation among coefficients of expansion

 Calorimetry & Heat transfer ● Calorimetry problems are similar as they all involve just equating heat lost to heat gained ● Heat loss of bullet embedded in wood ● Effective thermal resistance of composite slab, concentric cylinders or spheres. ● Temperature at the interface of two slabs, T shape, Y shape or any other shape. ● Stefan's law- power radiated by a body- radiant energy received on earth ● Newton’s cooling

 Work, power and energy and collisions ● Vertical circle● Work calculation when force and displacement are given in vector form● Work done by spring force● spring -mass ● Power ● Combined with collisons( Energy loss due to collision/ final speed after collision)● Collision in 2D

 COM & Rotational motion ● Body breaks into two parts during motion, velocity of COM ● Finding coordinates of COM( a portion of body is cut out ) ● MOI of rigid body using theorem of perpendicular and parallel axis ● Torque and rotational equilibrium ● Angular velocity and conservation of angular momentum ● Two discs placed on top of each other ● Circular disk or cylinder as pulley, cylinder and rope ● Rod pivoted at one end ● Rolling without slipping

 Gravitation ● Gravitational potential energy ● Energy required to launch a satellite into a orbit + energy to move from one orbit to another+ orbital time period ● Escape velocity ● Variation of g with altitude and depth ● Graphs ● Variable mass density problems

 Fluid mechanics ● Pressure due to two immiscible liquids ● Terminal velocity ● Excess pressure - soap bubble( work done to blow a bubble) and water droplet ● Work done by surface tension ● Buoyant force ● Equation of continuity and bernoulli's theorem ● Velocity of efflux ● Capillary rise

 Kinetic theory of gases ● Rms speed ● Molar specific heats  ● Mixture of gases - ratio of Cp and Cv, calculation of thermal energy, internal energy and total energy● Degrees of freedom● Mean free path

 Thermodynamics ● Calculation of work done or change in internal energy of system using first law of thermodynamics for various processes  ● Adiabatic process ● Work done and efficiency of cyclic process ● Carnot engine ● Indicator diagrams ( representation of same process in different state variables)

 SHM ● Equation of SHM ● Phase difference ● Spring-block system ( parallel and series combination) ● Change in time period of pendulum with length and mass ● Time period when point of suspension accelerates( lift, inclined plane and circular turn) ● Spring block rotation on a table

 String Waves & Sound waves ● General equation of travelling wave ● Tension in the string ● Interference of waves ● Stationary waves ● Organ pipes and resonance column ● Intensity of wave ● Doppler effect+beats ● Pressure wave

 Electrostatic field ● Charge configuration in equilibrium ● Force between two charged conductors after contact ● Field due to variable charge density ( density as a function of r) ● Flux involving cube ● Field due to dipole

 Electrostatic potential ● Work done in moving a charge between two points ● Potential of concentric spherical shells ● Graph of variation of potential and electric field with distance ● Potential energy of system of charges ● Motion of charged particle in an uniform electric field

 Current electricity ● Equivalent resistance● Power and heating effect● Potentiometer and metre bridge● Combination of cells

 Moving charges and magnetic effects of current ● Lorentz force, circular motion of a charged particle in magnetic field and helical motion ● Net magnetic field at a point due to current carrying conductors in various shapes ● Magnetic field of circular loops ( two loops arranged parallel and perpendicular to each other)  ● Solenoid and toroid● Galvanometer● Magnetic moment

 Electromagnetic induction and Alternating current ● Induced emf ( varying magnetic field, varying area, rotation of loop )● Motional emf● Mutual inductance and self induction● LCR circuit problems, Power factor ● Phase difference● Resonant frequency● Efficiency of transformer

 Ray optics ● Inclined mirrors + number of images formed ● Mirror equation ● Lateral shift ● Apparent depth ● Relation between critical angle and refractive index ( fish looking up through water surface ● Minimum deviation and prism ● Lens makers formula +thin lens equation ● Combination of lenses ( concave and convex lens separated by a distance, plano concave and plano convex lens) ● Velocity of image ● Lenses and glass slab ( shift in the position of images) ● Magnification of compound microscope and telescope

 Wave optics ● Interference conditions, maximum and minimum intensity ● Diffraction due to single slit ( angular direction of maxima or minima and central maxima width ● Young's double slit experiment ● Malus law

 Dual nature of matter ● De Broglie wavelength( sometimes combined with collision) ● Photoelectric effect -work function , threshold frequency, maximum velocity ( kinetic energy ) of ejected electrons, stopping potential ● graphs

 atoms ● Energy required for electron excitation ● Transition of electrons( diagram, frequency and wavelength of emitted radiation) ● Radii and energy levels of possible orbitals for a given central potential U(r)

 Nuclei ● Decay constant, half life ● Binding energy ● Energy released due to fission ● Alpha and beta decay

 EMW ● Equation of electromagnetic wave ● Relation between electric field component and magnetic field component ● Force on charged particle due to electromagnetic wave ● Energy density

 Semiconductors ● Concentration of electrons and holes ● Mobility of electrons ● Diodes circuit ● Band energy ● Zener diode as voltage regulator ● Photo diode ● Logic gates + boolean expression + input and output signals

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