To find the charge, integrate the given current function with respect to time from t = 0 to t = 2. The integral of current over time gives total charge. After solving, the charge is found to be 22 C, ...

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 ...

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.