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To find the focal length of a concave lens using a convex lens

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January 27, 2023

To find the focal length of a convex mirror using a convex lens

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January 27, 2023

To find the focal length of a convex lens by plotting the graph between u and v OR between 1/u and 1/v

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January 27, 2023

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Physics by Mamta Singh

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PHYSICS By MAMTA SINGH: I am a teacher.I teach Physics for both Boards and Competitions.

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IMPORTANT TOPICS FOR CLASS12 PHYSICS FOR BOARD EXAM

January 04, 2021

IMPORTANT TOPIC FOR CLASS12TH PHYSICS CBSE BOARD EXAMINATION: Subject : PHYSICS By- Mamta Singh Ch.-1 Electric flux Force and Torque on the electric dipole. Electric field on the axial and equatorial line. Statement of Gauss-Theorem. Applications of Gauss- Theorem,all three applications of Gauss theorem especially charged spherical shell. Ch.-2 Capacitance and factor’s affecting capacitance. Energy stored in a capacitor and its energy density( formula only). Capacitance of a parallel plate capacitor with a dielectric slab placed in between. (IMPORTANT) DRAW EQUIPOTENTIAL SURFACE TO A POINT CHARGE,LINE CHARGE,PLANE ELECTRIC FIELD AND DUE TO A ELECTRIC DIPOLE. Equi-potential surface and its properties. Relation between electric field and electric potential. Effect on various parameters when a dielectric slab is introduced b/w the plates of parallel plate capacitor. Principe of parallel plate capacitor. Potential at any general point of electric dipole. Ch.3 (7 marks)

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February 23, 2021

PHYSICAL WORLD: Physics,Scientific attitude,Scientific method,Unification,Reductionism and theory of Unification. UNITS AND MEASUREMENTS: Dimensions of important physical quantities,to find the dimensions of unknown constants & to derive a formula on the basis of dimensional analysis. MOTION IN A STRAIGHT LINE : All the four equations of motion,relative velocity (Derivation) MOTION IN A PLANE: Relation b/w linear speed and angular speed,centripetal acceleration,unit vector, null vector and negative vector ,projectile motion,triangle and paralleogram law of vector addition,subtraction of vectors,Numerical's on which direction to hold the umberella. LAWS OF MOTION: Friction and its type,Numerical's on concept of friction,free body diagram and connected motion,tension force,laws of limiting friction , angle of contact and angle of repose, acceleration of a body sliding down the inclined plane,banking of roads. WORK,ENERGY AND POWER: Work energy theorem, types of c

Important Formulae of Chaper 1,2,3 & 4 (Class 12th Physics)

September 18, 2021

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