Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202628 January 2026Morning ShiftPhysicsCurrent ElectricityActual

For the two cells having same EMF E and internal resistance r , the current passing through the external resistor 6 is same when both the cells are connected either in parallel or in series. The value of internal resistance r is _ _ _ _ .

Options

  1. A6
  2. B3
  3. C4
  4. D9

Correct answer

A. 6

Step-by-step solution

For series connection of two cells: I_s = 2E 2r + 6 . For parallel connection: I_p = E r/2 + 6 = 2E r + 12 . Given I_s = I_p : 2E 2r + 6 = 2E r + 12 . This gives 2r + 6 = r + 12 , so r = 6 .

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