ELECTRIC CHARGES AND FIELD | COULOMB'S FORCE NUMERICALS |12th NCERT PHYSICS |CBSE| NIOS | Part - 2

All about Electrostatics Chapter - 1 , Must Watch Video .
Mr. R. RUBAN , M.Sc.,M.Phil.,
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SOLVED PROBELMS :
1. The Electrostatics force of repulsive between two positively charged ions carrying equal charges is 3.7 * 10^-9 N When they are separated by a distance of 5 . How many electrons are missing from each ion?

2. A free pith ball A of 8 g carries a positive charge of 5*10^-8 C. What must be nature and magnitude of charge that should be given to a second Pith ball B fixed 5 cm below the former ball so that the upper ball is stationary ?

3.Two insulated charged copper sphere A and B have their separated by a distance of 50 cm. what is the mutual force of repulsion if the charge on each is 6.5 * 10^ -7 C ? The radii of the sphere are negligible compared to the distance of separation. Also compare this force with mutual gravitational attraction if each weighs 0.5 kg.

4. What is the force of repulsion if (i) each sphere is charged double the above amount and the distance between them is halved (ii) the two spheres are placed in water? ( k = 80)

5. Suppose the sphere A and B in the above question have identical sizes. A third sphere of the same size but uncharged is brought in contact with the first then brought in contact with the second and finally removed from the both. What is the new force of repulsion between A and B?

6.Two identical charges , Q each are kept at a distance r from each other. A third charge q is placed on the line joining the above two charges such that all the three charges are in equilibrium. What is the magnitude , sign and position of the charge q?

7. Two point charges +4e and +e are fixed distance 'a' apart Where should a third point charge q be placed on the line joining the two charges so that it may be in equilibrium ? In which case the equilibrium will be stable and in which unstable ?

8.A charge Q is to be divided on the two objects. What should be the values of the charges on the two objects so that the force between the objects can be maximum ?

9. The sum of two point charges is 7µC. They repel each other with a force of 1 N when kept 30 cm apart in free space. Calculate the value of each charge.

📌 Video Title: Electric Charges and Field | COULOMB'S FORCE NUMERICALS | 12th NCERT PHYSICS | CBSE | NIOS

🔹 Welcome to ABC Academy! In this video, we will cover Electric Charges and Fields, focusing on Coulomb’s Law and its numerical problems. This session is perfect for Class 12 NCERT, CBSE, and NIOS Physics students preparing for board exams.

🔥 What You’ll Learn:
✅ Introduction to Electric Charges and Fields
✅ Detailed explanation of Coulomb’s Law
✅ Step-by-step numerical problem-solving
✅ Important formulas and concepts for board exams

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