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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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