Electric Charge and Electric Field
NIOS · Class 12 · Physics
Step-by-step guide to study Electric Charge and Electric Field in NIOS Class 12 Physics. Topics to cover, practice strategy, and time allocation.
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Learn the Theory
Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.
Practice Problems
Solve textbook exercises and additional practice questions. There are 43 questions available for this chapter.
Revise & Test
Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.
Spaced Revision
Revisit Electric Charge and Electric Field after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.
What to Focus On
- Only electrons are transferred during frictional charging; protons do not move.
- A body that loses electrons becomes positively charged; a body that gains electrons becomes negatively charged.
- Like charges repel; unlike charges attract.
- Conservation of Charge: Total charge of an isolated system is always constant.
- Quantisation of Charge: Q = Ne, where N is an integer and e = 1.6 × 10⁻¹⁹ C.
- A body cannot have fractional multiples of e (e.g., 1.5e is not possible).
- Coulomb's Law: F = kq₁q₂/r², where k = 9 × 10⁹ N·m²/C².
- ε₀ = 8.85 × 10⁻¹² C²·N⁻¹·m⁻² (permittivity of free space).
- Force is attractive for unlike charges and repulsive for like charges.
Common Mistakes to Avoid
Coulomb's law applies to all charged objects, regardless of their shape or size.
The electric field at a point is produced by the test charge placed at that point.
Electric field lines actually exist physically in space and represent the path followed by a positive charge.
Memory Tips
Two types of electric charge — positive and negative
Conservation of charge — charge is neither created nor destroyed, only transferred
Quantisation of charge — charge always exists as multiples of e = 1.6×10⁻¹⁹ C
Coulomb's Law formula: F = kq₁q₂/r²
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Practice Quiz
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