Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE MainPhysicsCurrent Electricity

An ideal DC voltage source of V volts is connected to a circuit through a switch. The circuit consists of a 12 resistor connected in parallel with a second branch. The second branch contains a 2 resistor connected in series with a parallel combination of two sub-branches: one sub-branch has a 10 resistor, and the other sub-branch has an uncharged capacitor C in series with a 2.5 resistor. The switch is closed at t =

Correct answer

2

Step-by-step solution

At t = 0 , the uncharged capacitor acts as a short circuit. The second branch consists of the 2 resistor in series with the parallel combination of the 10 and 2.5 resistors. The equivalent resistance of this parallel pair is: R_ p0 = 10 2.5 10 + 2.5 = 25 12.5 = 2 The total resistance of the second branch at t = 0 is: R_ branch2, 0 = 2 + 2 = 4 The total equivalent resistance of the circuit at t = 0 is the parallel combination of the 12 resistor and the 4 branch: R₀ = 12 4 12 + 4 = 48 16 = 3 The initial current is I₀

Practice Current Electricity on Quantrex Academy →

More from Current Electricity

A metal wire of cross-sectional area 0.5 mm ^2 and length 100 m is connected across a battery of e.m.f. 2 V and internal resistance 1 . The density, atomic mass and electrical cond 2026As shown in the figure, the resistance of a galvanometer G can be found by the half-deflection method. Here the resistance R₂ is adjusted such that when the key K is closed the def 2026The stored charge in the capacitor in steady state of the following circuit is ________ C. 2026A moving coil of galvanometer when shunted with 2 , resistance gives a full scale deflection for a current of 500 mA. When a resistance of 470 , is connected in series it gives a f 2026Two cells of emfs 1 V and 2 V and internal resistance 2 , and 1 , , respectively connected in parallel, gave a current of 1 A through an external resistance. If the polarity of one 2026Refer to the circuit diagram given below. The heat generated across the 6 , resistance in 100 second is 100 J. The value of is _______. (Nearest integer) 2026In an experiment to determine the resistance of a given wire using Ohm's law, the voltmeter and ammeter readings are noted as 10 V and 5 A , respectively. The least counts of voltm 2026Under steady state condition the potential difference across the capacitor in the circuit is _______ V. 2026 Full Current Electricity list All JEE Main PYQs