CBSE Class 12 Physics 2026: Electrostatics + Current Electricity (Top 20 Most Expected Q &A with Solutions)

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 CBSE Class 12 Physics के Electrostatics और Current Electricity के सबसे महत्वपूर्ण 20 सवाल–जवाब, formulas, derivations और numericals के साथ। Q1) Coulomb’s Law लिखिए और SI unit बताइए। Solution: F = 1 4 π ε 0 q 1 q 2 r 2 F=\frac{1}{4\pi\varepsilon_0}\frac{q_1q_2}{r^2} F = 4 π ε 0 ​ 1 ​ r 2 q 1 ​ q 2 ​ ​ F F F की unit: Newton (N) ε 0 \varepsilon_0 ε 0 ​ : permittivity of free space Force line joining charges के along होता है। Q2) Point charge के कारण Electric Field का सूत्र (vector form)। Solution: E ⃗ = 1 4 π ε 0 q r 2 r ^ \vec E=\frac{1}{4\pi\varepsilon_0}\frac{q}{r^2}\hat r E = 4 π ε 0 ​ 1 ​ r 2 q ​ r ^ दिशा: + q +q + q से बाहर, − q -q − q की तरफ। Q3) Electric Flux की परिभाषा और unit। Solution: Φ E = E ⃗ ⋅ A ⃗ = E A cos ⁡ θ \Phi_E=\vec E\cdot \vec A = EA\cos\theta Φ E ​ = E ⋅ A = E A cos θ Unit: N   m 2 / C N\,m^2/C N m 2 / C Q4) Gauss Law लिखिए। Solution: ∮ E ⃗ ⋅ d A ⃗ = Q e n c ε 0 \oint \vec E\cdot d\vec A=\frac{Q_{enc}}{\varepsilon_0} ∮ E ⋅ d A...
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CBSE 2026 Class 11 Physics: Questions (With Answers)

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CBSE 2026 ke liye Class 11 Physics ke important short questions yahan diye gaye hain. Ye quick revision aur unit test/board preparation ke liye helpful hain. Neeche answer key bhi di gayi hai.
IMPORTANT QUESTIONS

  • SI system kya hota hai?

  • SI base units kitni hoti hain? Naam likho.

  • Fundamental aur derived quantities me difference?

  • Least count kya hota hai?

  • Accuracy aur precision me difference?

  • Significant figures kya hote hain?

  • Dimensional formula kya hota hai?

  • Dimensionless quantities ke 3 examples.

  • Dimensional analysis ka use (2 points).

  • Dimensional analysis ki 2 limitations.

  • Force ka dimensional formula.

  • Pressure ka dimensional formula.

  • Energy ka dimensional formula.

  • Power ka dimensional formula.

  • Velocity ka dimensional formula.

  • Acceleration ka dimensional formula.

  • Density ka dimensional formula.

  • Frequency ka dimensional formula.

  • Absolute error aur relative error me difference.

  • Percentage error kya hota hai?


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  • SI = International System of Units.

  • 7 base units: m, kg, s, A, K, mol, cd.

  • Fundamental independent; derived fundamental se banti hain.

  • Instrument ki minimum measurable value.

  • Accuracy = true value ke close; precision = repeated readings me closeness.

  • Measured value ki meaningful digits.

  • Quantity ko M, L, T… powers me express karna.

  • Strain, refractive index, coefficient of friction.

  • Formula verify + unit conversion + relation check.

  • Constant find nahi karta; complex/vector relations confirm nahi karta.

  • Force: [M L T⁻²]

  • Pressure: [M L⁻¹ T⁻²]

  • Energy: [M L² T⁻²]

  • Power: [M L² T⁻³]

  • Velocity: [L T⁻¹]

  • Acceleration: [L T⁻²]

  • Density: [M L⁻³]

  • Frequency: [T⁻¹]

  • Absolute: |measured-true|, Relative: absolute/true.

  • Percentage error = relative × 100.


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    CBSE Class 12 Physics 2026: Electrostatics + Current Electricity (Top 20 Most Expected Q &A with Solutions)

    -
     CBSE Class 12 Physics के Electrostatics और Current Electricity के सबसे महत्वपूर्ण 20 सवाल–जवाब, formulas, derivations और numericals के साथ। Q1) Coulomb’s Law लिखिए और SI unit बताइए। Solution: F = 1 4 π ε 0 q 1 q 2 r 2 F=\frac{1}{4\pi\varepsilon_0}\frac{q_1q_2}{r^2} F = 4 π ε 0 ​ 1 ​ r 2 q 1 ​ q 2 ​ ​ F F F की unit: Newton (N) ε 0 \varepsilon_0 ε 0 ​ : permittivity of free space Force line joining charges के along होता है। Q2) Point charge के कारण Electric Field का सूत्र (vector form)। Solution: E ⃗ = 1 4 π ε 0 q r 2 r ^ \vec E=\frac{1}{4\pi\varepsilon_0}\frac{q}{r^2}\hat r E = 4 π ε 0 ​ 1 ​ r 2 q ​ r ^ दिशा: + q +q + q से बाहर, − q -q − q की तरफ। Q3) Electric Flux की परिभाषा और unit। Solution: Φ E = E ⃗ ⋅ A ⃗ = E A cos ⁡ θ \Phi_E=\vec E\cdot \vec A = EA\cos\theta Φ E ​ = E ⋅ A = E A cos θ Unit: N   m 2 / C N\,m^2/C N m 2 / C Q4) Gauss Law लिखिए। Solution: ∮ E ⃗ ⋅ d A ⃗ = Q e n c ε 0 \oint \vec E\cdot d\vec A=\frac{Q_{enc}}{\varepsilon_0} ∮ E ⋅ d A...
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