Lesson 6.1 – Coulomb’s Law

Foundation (Q1–5)

1. State Coulomb’s law.

2. What does the symbol q represent?

3. Is electrostatic force attractive, repulsive, or both?

4. Write the formula for electric force between two point charges.

5. What is the unit of electric charge?

Intermediate (Q6–10)

6. Two charges +3 C and +2 C are 4 m apart. Find the force between them.

7. Explain effect of doubling distance between charges.

8. Describe how medium affects force between charges.

9. What is permittivity? Define ε₀.

10. Explain difference between direct and inverse-square proportionality.

Advanced (Q11–15)

11. Derive vector form of Coulomb’s law.

12. Compare Coulomb force with gravitational force.

13. Analyse system of three charges and find net force on one.

14. Explain role of dielectric constant in reducing electrostatic force.

15. Discuss limitations of Coulomb’s law.

Lesson 6.2 – Electric Field & Field Intensity

Foundation (Q1–5)

1. Define electric field.

2. What is electric field intensity (E)?

3. Write E = F/q.

4. Draw electric field lines for a positive point charge.

5. State unit of electric field.

Intermediate (Q6–10)

6. Calculate electric field at distance r from charge Q.

7. Distinguish between uniform and non-uniform electric fields.

8. Explain why electric field lines never cross.

9. Draw field pattern for dipole.

10. Calculate E at midpoint between +Q and –Q.

Advanced (Q11–15)

11. Derive E = kQ/r².

12. Solve electric field problem with multiple charges.

13. Show how electric field relates to potential gradient.

14. Explain superposition principle for E.

15. Analyse E-field inside hollow conductor.

Lesson 6.3 – Electric Potential & Potential Energy

Foundation (Q1–5)

1. Define electric potential.

2. Write V = W/q.

3. What is the unit of potential?

4. Define electric potential energy.

5. What is meant by potential difference?

Intermediate (Q6–10)

6. Calculate potential at distance r from charge Q.

7. Explain difference between potential and electric field.

8. Draw equipotential surfaces around a point charge.

9. Why is no work done moving charge along equipotential surface?

10. Find potential energy of charge in electric field.

Advanced (Q11–15)

11. Derive V = kQ/r.

12. Solve multi-point potential calculation.

13. Use V to compute electric field using E = −dV/dr.

14. Analyse potential distribution in dipole.

15. Solve capacitor charging energy problem using potential.

Lesson 6.4 – Electric Flux & Gauss’s Law

Foundation (Q1–5)

1. Define electric flux.

2. Write formula Φ = EA cosθ.

3. What is Gauss’s law?

4. State unit of electric flux.

5. Give example of Gaussian surface.

Intermediate (Q6–10)

6. Calculate flux through surface area A with field E.

7. Explain why Gauss’s law requires symmetry.

8. Apply Gauss’s law to infinite line charge.

9. Show flux through closed surface depends only on enclosed charge.

10. Compare flux for spheres of different radii enclosing same charge.

Advanced (Q11–15)

11. Derive E = λ/2πεr for line charge.

12. Use Gauss’s law to find field near infinite plane.

13. Analyse flux through cube enclosing point charge.

14. Discuss limitations of Gauss’s law in irregular shapes.

15. Solve multi-charge distribution using appropriate Gaussian surfaces.

Lesson 6.5 – Capacitors & Capacitance

Foundation (Q1–5)

1. Define capacitance.

2. Write C = Q/V.

3. What is dielectric material?

4. State SI unit of capacitance.

5. Define parallel plate capacitor.

Intermediate (Q6–10)

6. Derive C = εA/d.

7. Explain effect of inserting dielectric.

8. Compare series and parallel capacitors.

9. Calculate energy stored in capacitor.

10. Solve capacitor combination problem.

Advanced (Q11–15)

11. Derive energy stored using area under Q–V graph.

12. Calculate capacitance of capacitor with partial dielectric.

13. Analyse charging and discharging graphs qualitatively.

14. Explain role of capacitors in filtering circuits.

Solve capacitor problem involving electric field and energy density.