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

Motion in 2D
Projectile motion

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

● 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

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
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

● 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)

● 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 

● 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)

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

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

● 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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  1. My physics is weak but my chemistry and mathematics are strong but I am a Hindi medium student . There is nothing in Hindi only English it is my problem please help me

    User name: Jolly_ylloJ
    Thanks for the material you are providing, helping us

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