Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEST2026PhysicsCurrent Electricity

All the capacitors in a given circuit are initially fully charged with all switches open. At a later time t , all the switches are simultaneously closed. The current flowing through the circuit at that instant is given by

Options

  1. A4V₀/R_L
  2. B3V₀/R₀
  3. CV₀/R_L
  4. DV₀/R₀

Correct answer

A. 4V₀/R_L

Step-by-step solution

In the initial steady state with all switches open, the capacitors act as open circuits, meaning no direct current flows through the circuit. The top wire is connected to ground at the first node and also through R_L at the end. Since there is no voltage source in this path, the potential of all nodes on the top wire is 0 . The bottom wire is connected to the lower terminal of the battery. Assuming the top terminal of the battery is positive, the potential of the bottom wire is -V₀ . Since no current flows, all nod

Practice Current Electricity on Quantrex Academy →

More from Current Electricity

The voltage – current graph for a metal wire of uniform area of cross section at two different temp T and T' is shown. Then choose the correct statement: 2026Find the current through the 40 resistor in the given circuit having a diode, three resistors and two cells. 2026A series combination of 'n' cells of emf 'E' and internal resistance 'r' each, are connected across the external resistance 'R'. If the internal resistance 'r' is negligibly small, 2026An electric coil is rated 400W, 200V. It is cut into two equal parts and connected in parallel to the same source of 200V. Calculate the percentage increase in energy produced per 2026A galvanometer of resistance 50 is having 30 divisions and a current sensitivity 10 mA/div. What should be the shunt resistance so that it can be converted into an ammeter of range 2026Current in a conductor is expressed as I = 8t^3 + 3t^2 + 1 , where current I is measured in amperes and time t is measured in seconds. What is the charge that flows through a cross 2026In the given circuit, an ideal voltmeter connected across 6 reads 5V. The internal resistance r of each cell is: 2026A wire of length 1m has a resistance of 20 at 0^ C. It is uniformly stretched so that its length increases by 21%. Assuming the volume of the wire remains constant, the percentage 2026 Full Current Electricity list All NEST PYQs