XII Physics 2025 A circuit consisting of a capacitor C, a resistor of resistance R and an ideal скачать в хорошем качестве

XII Physics 2025 A circuit consisting of a capacitor C, a resistor of resistance R and an ideal

12th Physics CBSE PYQ 2025 A circuit consisting of a capacitor C, a resistor of resistance R and an ideal battery of emf V, as shown in figure is known as RC series circuit. As soon as the circuit is completed by closing key S1, (keeping S2 open) charges begin to flow between the capacitor plates and the battery terminals. The charge on the capacitor increases and consequently the potential difference Vc (= q/C) across the capacitor also increases with time. When this potential difference equals the potential difference across the battery, the capacitor is fully charged (Q = VC). During this process of charging, the charge q on the capacitor changes with time t as q=Q[1 - e ^ (-t/RC)] The charging current can be obtained by differentiating it and using d(e^mx)/dx = me^mx. Consider the case when R= 20 kΩ, C = 500 μF and V= 10 V. (i) The final charge on the capacitor, when key S1 is closed and S2 is open, is (A) 5 μC (B) 5 mC (C) 25 mC (D) 0.1 C (ii) For sufficient time the key S1 is closed and S2 is open. Now key S2 is closed and S1 is open. What is the final charge on the capacitor ? (A) Zero (B) 5 mC (C) 2.5 mC (D) 5 μC (iii) The dimensional formula for RC is (A) [M L2 T-3 A-2] (B) [M0 L0 T-1 A0] (C) [M-1 L-2 T4 A2] (D) [M0 L0 T A0] (iv) The key S1 is closed and S2 is open. The value of current in the resistor after 5 seconds, is (A)1/2√e mA (B) √e mA (C) 1/√e mA (D) 1/2e mA OR (iv) The key S1 is closed and S2 is open . The initial valve of chargine current in the resistor, is (A) 5 mA (B) 0.5mA (C) 2 mA (D) 1 mA CBSE 12th Physics Solution Class 12th CBSE Physics Class XII CBSE Physics CBSE 12th PYQ 2025 Physics CBSE 12th PYQ 2024 Physics CBSE with PYQ 2023 2025 Physics 12th PYQ CBSE Solution Physics 12th CBSE sample paper solution Physics Class 12th CBSE Physics Previous year questions solution Class 12th CBSE Physics Previous year questions solution CBSE Maths 12th PYQ Solution Physics 12th CBSE Case Study Based Questions 2025 2024 #cbseboard #cbse #cbseclass12 #maths #physics #study #boardexam #class12th #examination #education #science #physics