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Charge and Coulombs Law worksheet Electrostatic class 12th Ncert Chapter 1
Class 12 Physics – Worksheet
Chapter 1: Electric Charges & Coulomb’s Law (NCERT)
1. Define electric charge.
Electric charge is a fundamental property of matter responsible for electric interaction.
2. State Coulomb’s law.
The force between two point charges is directly proportional to the product of charges and inversely proportional to the square of distance between them.
3. What is meant by quantisation of charge?
Charge exists in discrete multiples of elementary charge: q = ne.
4. State the principle of conservation of charge.
Total charge of an isolated system remains constant.
5. Is electric charge dependent on reference frame?
No, electric charge is invariant in all reference frames.
6. Two charges of +2 μC and +3 μC are separated by 30 cm. Find the electrostatic force between them.
F = 6 N (repulsive)
7. Two charges of +4 μC and −2 μC are placed 50 cm apart. Calculate the force between them.
F = 0.288 N (attractive)
8. By what factor will force change if distance between two charges is halved?
Force becomes four times.
9. Find the number of electrons corresponding to a charge of −3.2 × 10⁻¹⁹ C.
Number of electrons = 2
10. Two identical charges repel each other with force 5 N. What will be the force if both charges are doubled?
Force becomes 20 N.
11. Calculate the force between two charges of 1 μC each placed 1 m apart in vacuum.
F = 9 × 10⁻³ N
12. What will be the force between two charges if dielectric constant of medium is 5 and force in air is 10 N?
F = 2 N
13. Distance between two charges is increased to three times. Find the new force if original force was 12 N.
F = 4/3 N
14. How much charge is transferred by a current of 2 A flowing for 10 seconds?
Q = 20 C
15. Find the force between +q and −q charges separated by distance r.
F = (1 / 4πϵ₀) · (q² / r²), attractive
6. Define quantisation of charge.
Charge exists in discrete packets: q = ne, where n is an integer.
7. What is the value of elementary charge?
e = 1.6 × 10⁻¹⁹ C
8. State the principle of conservation of charge.
Total charge of an isolated system remains constant.
9. Does charge depend on the reference frame?
No, charge is invariant in all reference frames.
10. What is the effect of dielectric medium on force?
The force decreases by a factor equal to the dielectric constant of the medium.
11. Define 1 Coulomb.
1 C is the charge transferred by 1 A current in 1 second.
12. What is permittivity of free space?
ϵ₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻²
13. Force between +q and –q is?
Attractive force.
14. What happens if both charges are doubled?
Force becomes four times.
15. Is Coulomb’s law valid for moving charges?
No, it is valid only for stationary point charges.
16. What type of force is electrostatic force?
It is a conservative force.
17. Can charge be created?
No, total charge is conserved.
18. What happens if distance becomes half?
Force becomes four times.
19. Name the constant in Coulomb’s law.
Coulomb’s constant (1 / 4πϵ₀).
20. Is electrostatic force long range?
Yes, it is a long-range force.