Electric Charges and Fields — Class 12 Physics NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 12 Physics chapter "Electric Charges and Fields" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 12 Physics chapter "Electric Charges and Fields" — 8 important questions with detailed answers for CBSE bo…
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Key Questions Covered:
- Define electric charge. State the SI unit and symbol for electric charge.
- State Coulomb's law. Two charges of 2 μC and 3 μC are separated by 30 cm. Cal…
- What is electric field? Write its definition and SI unit.
- + 5 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define electric charge. State the SI unit and symbol for … | ✓ Solved |
| State Coulomb's law. Two charges of 2 μC and 3 μC are sep… | ✓ Solved |
| What is electric field? Write its definition and SI unit. | ✓ Solved |
Showing 3 of 8 questions
Q1: Define electric charge. State the SI unit and symbol for electric charge.
Electric charge is the fundamental property of matter responsible for electromagnetic interactions. It is conserved and quantized.
SI Unit: Coulomb (C)
Symbol: q or Q
Quantization: q = ne, where n is an integer and e = 1.6 × 10⁻¹⁹ C (elementary charge)
Q2: State Coulomb's law. Two charges of 2 μC and 3 μC are separated by 30 cm. Calculate the electrostatic force between them.
Coulomb's Law: F = k(q₁q₂)/r²
where k = 9 × 10⁹ N⋅m²/C² (Coulomb's constant)
Given: q₁ = 2 μC = 2 × 10⁻⁶ C
q₂ = 3 μC = 3 × 10⁻⁶ C
r = 30 cm = 0.3 m
Step 1: F = (9 × 10⁹) × (2 × 10⁻⁶) × (3 × 10⁻⁶) / (0.3)²
Step 2: F = (9 × 10⁹) × (6 × 10⁻¹²) / 0.09
Step 3: F = 54 × 10⁻³ / 0.09
Step 4: F = 0.6 N
Fi...
Q3: What is electric field? Write its definition and SI unit.
Electric Field (E) is the region around a charge where another charge experiences an electrostatic force.
Definition: E = F/q₀ (force per unit positive test charge)
SI Unit: N/C or V/m (Newton per Coulomb or Volt per meter)
Electric field due to point charge q at distance r:
E = kq/r² = q/(4πε₀r²...
Showing 3 of 8 questions. Visit the full page for complete solutions.