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 |

THANKS FOR READING

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