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We could see a hurry to schools and other centres by students and parents regarding the declaration of results. The confusion created by some schools by saying that CBSE is going to declare the result on 15 May caused the havoc.
Don’t worry now. CBSE results may a take a few more days to come.
CBSE has already given a statement that results will be declared before 26 May 2014. So, let;s wait a few days without panicking.
Let’s hope a very good result this time.
Can the frictional electricity produced during landing of a plane be used for constructive purposes?
As we know that in aeroplane during landing the charged produced in it due to the friction with ground are earthed through its wheels; can this charge be stored with the help of a capacitor and used for useful purpose?
I feel that this is a metter for research.
If you feel otherwise and know some method to tap this potential, please post.
HC Verma’s Concepts of Physics – Chapter 10 – Question 15
Find the moment of inertia of a uniform square plate of mass m and edge a about one of its diagonals.
The question was posted by Ankit
Let the moment of inertia about the axis through the centre of the square plate perpendicular to the plane, assumed to be along Z axis, be I. Now the square plate will be in the XY plane. Let the X axis and Y axis be parallel to the edges and passing through the centre.
Then, we know that Ix = Iy = ma2/12
Then, according to perpendicular axis theorem,
Iz = Ix + Iy = 2Ix=2ma2/12=ma2/6
Now, imagine that X and Y axes are along the diagonals. (The diagonals of a square are also mutually perpendicular.)
Again, according to perpendicular axis theorem, Iz = Ix + Iy = 2Ix
The MI about the diagonal about its diagonal, Ix = Iz/2 = ma2/12
What does Rheostat controls? electron drift velocity or quantity of electrons?
We know I=nAve
n=quantity of electron
Were you searching for Physics 212?
The following links will help you.
Physics 212 is the Physics Course on Electricity and Magnetism by University of Illinois.
(Many other colleges and universities may have a couse by the same name but dealing with different topics in Physics.
The advantage of Physics212course of Illinois is that many course materials and animations etc are available online and can be used by any prospective student.
- Physics homework chapter 9 (gasstationwithoutpumps.wordpress.com)
- Mark Distribution in Physics for CBSE for 2013 Board Exam (AISSCE) (physicsfans.com)