Electrostatic Potential and Capacitance — Class 12 Physics NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 12 Physics chapter "Electrostatic Potential and Capacitance" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 12 Physics chapter "Electrostatic Potential and Capacitance" — 8 important questions with detailed answers…
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Key Questions Covered:
- Define electric potential. Write expression for potential due to point charge.
- What is potential difference? A charge of 2 C is moved from point A to point …
- Define capacitance. Write expression for capacitance of parallel plate capaci…
- + 5 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define electric potential. Write expression for potential… | ✓ Solved |
| What is potential difference? A charge of 2 C is moved fr… | ✓ Solved |
| Define capacitance. Write expression for capacitance of p… | ✓ Solved |
Showing 3 of 8 questions
Q1: Define electric potential. Write expression for potential due to point charge.
Electric Potential (V): Work done per unit positive charge in bringing it from infinity to that point in electric field.
V = W/q₀ (potential is scalar quantity)
SI Unit: Volt (V) or J/C
Potential due to point charge q at distance r:
V = kq/r = q/(4πε₀r)
where k = 9 × 10⁹ N⋅m²/C²
ε₀ = 8.85 × 10⁻¹...
Q2: What is potential difference? A charge of 2 C is moved from point A to point B, and 20 J of work is done. Find potential difference between A and B.
Potential Difference (V_AB): Difference in electric potential between two points.
V_AB = V_A - V_B = W_AB/q
where W_AB = work done by external agent to move charge q from B to A
Given: q = 2 C
W = 20 J
Step 1: V_AB = W/q = 20/2 = 10 V
Final Answer: Potential difference = 10 V
This means point ...
Q3: Define capacitance. Write expression for capacitance of parallel plate capacitor.
Capacitance (C): Ability of conductor to store charge for given potential difference.
C = Q/V (charge per unit potential difference)
SI Unit: Farad (F) = C/V
For Parallel Plate Capacitor:
C = ε₀εᵣA/d = ε₀A/d (in vacuum/air)
where ε₀ = 8.85 × 10⁻¹² F/m (permittivity of free space)
εᵣ = relative p...
Showing 3 of 8 questions. Visit the full page for complete solutions.