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Hello students in this session we will study about Coulomb’s law and its vector form and also learn some important points about this law. So lets start…
What is Coulomb’s law ?
The force of attraction or repulsion between two stationary electric charges is directly proportional to the product of magnitude of the two charges and is inversely proportional to the square of the distance between them.
👉 This electrostatic force acts along the line joining those two charges.
👉 Here constant K is called electrostatic constant.
🔴 Definition of 1 Coulomb
“1 Coulomb is that charge which when placed at a distance of one meter in air or vacuum from an identical charge, repels it with a force of 9 ×109 N”.
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Coulomb’s Law in Vector Form
👉 LIMITATIONS OF COULOMB’S LAW :
1) Coulomb’s law is valid for point charges only.
2) Coulomb’s law is valid only for static charges.
Principle of Superposition
Coulomb’s force between two point charges is independent of presence of other charges and so the principle of superposition is valid for it, i.e., force on a charged particle due to a number of point charges is the resultant of forces due to individual point charges.
✅Sharpen Your Pencil ✍️
Q. 1 Electric charges of 1μ C , -1μC and 2μC are placed in air at the corners A,B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C is
(a) 0.9 N (b) 1.8N (c) 2.7 N (d) 3.6 N
Answer:
Q. 2 The charges on two spheres are +7μC and –5μC respectively. They experience a force F. If each of them is given an additional charge of –2μC, the new force of attraction will be
(a) F (b) F/2 (c) F/3 (d) 2F
🔻Comment the Answer💬
Q. 3 When the distance between two charged particle is halved, the force between them becomes –
(A) One fourth (B) One half
(C) Double (D) Four times
🔻Comment the Answer💬
Hello Students,
Physics is the most crucial subject for all the students of class 11th, 12th and also for the students who are preparing for NEET or JEE. Physics is very important to understand many higher level concepts, which are derived from the concepts that we learn in class 11th and 12th.
So better understanding of all the concepts in physics is very necessary, not only to get good marks in physics exam but also to learn physics more effectively.
Myself Umesh Rajoria and I am a Physics teacher. I have 15 years teaching experience of physics.
You will be happy to know that i have prepared physics notes according to the latest NCERT syllabus for CBSE and other state board students of class 12.
👉These Physics notes for class 12 help the students to understand the concept of Physics easily and retain the formulas and derivations for a longer time.
👉All the diagrams, formulas, derivations and solved numerical are included in these Physics Notes . These notes will be very useful during the preparation of 12th board exams and save most of the time of the students.
🔷 Dear Students,
If You Like the Information and Notes then please Comment and share the post. Which physics topic you want to know please tell us by commenting. I will surely reply your comment. Thanks 🙂
Wonderful efforts sir. Hats off to you.
Thank you sir