SAI'S SCIENCE AND MATHS CLASSES

Coulombs law is Inverse square law Since force is a vector the principle of superposition involves vector addition Electric field is actually the stress experienced on the point by an electric charge, it is the force experienced on a unit positive charge placed at that point. F=qE Unit of electric field is N/C Electric field is known by other terms such as flux density and intensity of electric field it also have an inverse square relation with distance  Electric field lines never passes through a metal so inside the conductor the electric field E=0 Electric field can be considered as the negative potential gradient E=-dV/dr By Gauss theorem E.A=q/epsilon not there fore E=q /A  X epsilon not

Parsec : A unit of distance It is used for measuring distances of long range ie the distance between planets, diameter of distant galaxies etc. One   parsec   is the distance at which one astronomical unit subtends an angle of one arcsecond In the figure OB is one parsec AB= 1 astronomical unit ∟AOB= 1 second  Tan(1’’)=AB/OB OB=AB / tan(1”)=1 AU/1’’=206264.81 AU

Dear Students  A new academic year with new hopes and aspirations are on Congratulations to those who had scored good marks and those who tried their level best to attain a comfortable score. Sai's classes is always with you to cherish your dream  Plus 2 chapter one is briefed to you in the link  http://saisiyer.blogspot.in/p/plus.html

Dilation in time that explains the Twin Paradox , Assume out of two twins one entered a  Time Machine which is moving with a velocity of 0.9  c , where " c" is the velocity of light in vacuum then 40 years in the Time Machine corresponds to 92 years on earth ; that is of the twins the time traveler will be younger compare to his twin brother on earth This is Twin Paradox in special theory of relativity .

Relation between horizontal range and maximum height of a Projectile The relation between the range   on the horizontal plane and the maximum height   reached at   is: Proof  ×  (This is originally edited by Saisundar for wiki) For details refer  Wiki pedia

In a meter bridge a resistance of R Ω  and a shunt resistance S Ω are connected as shown, the null point is found to be at 40cm from A If a 12 Ω resistor is connected in parallel with S the null point changes to 50cm Find R and S. 1 st case R / 40=S / 60 R=2S/3 --------------- (1) 2 nd case R / 50= [12S / (12+S)] / 50      (12 Ω and S Ω are connected in parallel )  ie R=12S / (12+S) ---------------(2) solving (1) and (2) S=6 Ω and R=4 Ω

SAI'S SCIENCE AND MATHS CLASSES: Renewable Energy-Solar : The conventional energy sources are depleting at an exponential  rate .The energy crisis is a major concern for the nation around. The c...