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This Chapter of Chemical Kinetics is based on NCERT CBSE and state boards of India. These notes is made with the help of the book S Dinesh, Pradeep and Modern. And some topic is noted by NCERT books.
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Class- 12
Unit- 1 (Electrostatics notes)
Written by Aniketncert
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The Electrostatic Field-
To calculate the force exerted by some electric charges, q1, q2, q3, ... (the source charges) on
another charge Q (the test charge) .
We can use the principle of superposition. This principles tates that the interaction between any two charges is completely unaffected by the presence of other charges. The force exerted on Q by q1, q2, and q3 (see Figure) 00is therefore equal to the vector sum of the force F 1 exerted by q1 on Q, the force F2 exerted by q2 on Q, and the force F3 exerted by q3 on Q.
The force exerted by a charged particle on another charged particle depends on their separation distance, on their velocities and on their accelerations. In this Chapter we will consider the special case in which the sourcecharges are stationary.
The electric field produced by stationary source charges is called and electrostatic field.The electric field at a particular point is a vector whose magnitude is proportional to the total Force acting on a test charge located at that point, and whose direction is equal to the direction of the force acting on a positive test charge. The electric field E , generated by a collection of
source charges, is defined as
E = FQ
where F is the total electric force exerted by the source charges on the test charge Q. It is
assumed that the test charge Q is small and therefore does not change the distribution of the
source charges. The total force exerted by the source charges on the test charge is equal to
F = F 1 + F 2 + F 3 + ... = 1
In most applications the source charges are not discrete, but are distributed continuously over
some region. The following three different distributions will be used in this course:
1. line charge l: the charge per unit length.
2. surface charge s: the charge per unit area.
3. volume charge r: the charge per unit volume.
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