Using the drift velocity formula vd = I/nAe’ where n = 8 × 10²⁸ electrons/m³, A = 5 × 10⁸ m², and e = 1.6 × 10⁻¹⁹ C, we get t = 6.4 × 10³ s Answer: (c). Class ...
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The energy stored in the battery is given as 7.20 × 10⁴ J, and the charging voltage is 12 V. Using the relation: E = QV where: . E = Energy (7.20 × 10⁴ J) . Q = Charge (to ...
The drift velocity (vd) of free electrons in a conductor is directly proportional to the applied potential difference (V), given by vd ∝ V. When V is doubled, vd also doubles. Hence, the correct answer is (c) be doubled of ...
Resistance R∝ l/A , and for the new wire, R′ = R/4.Heat H ∝ 1/R , so H′ = 4H. Answer: (d) 4H. Class 12th Science Physics NCERT MCQ Questions NCERT Books MCQ Questions Session 2024-2025.
Given P = I² R₃, substituting values: 6 = (2.0)² R₃ ⟹ R₃ = 1.5Ω Voltage across R₃, V₃ = IR₃ = 2.0 ×1.5 = 3V. Answer: (c) 3V. Class 12th Science Physics NCERT MCQ Questions NCERT Books MCQ Questions ...