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 ...

The wire is divided into two equal semicircles, each with resistance R. These are in parallel, so the effective resistance is: 1/Reff = 1/R + 1/R Thus, Reff = R/2. Answer: (b) R/2. Class 12th Science Physics NCERT MCQ Questions NCERT ...