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💬
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Myself Umesh Rajoria and I am a Physics teacher. I have 15 years teaching experience of physics.
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