JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 25 June 2022, Shift 2, Physics Q39

Question 39 of 90 in this shift, Physics question 9 of 30, Section A.

Two cells of same emf but different internal resistances

r_1

and

r_2

are connected in series with a resistance

R

. The value of resistance

R

, for which the potential difference across second cell is zero, is :

(1) $r_2 - r_1$ Official answer
(2) $r_1 - r_2$
(3) $r_1$
(4) $r_2$

Official answer

Option 1

NTA final key.

Chapter: Current Electricity
Topic: Kirchhoff's Laws
Idea tested: Series Combination of Cells

Same idea in other shifts

Asked 4× in all

3 Apr 2025, Shift 2 · Q48Two cells of emfs 1 V and 2 V and internal resistances $2\ \Omega$ and $1\ \Omega$ , respectively, are connected in series with an external…MediumNumerical value
27 Aug 2021, Shift 1 · Q12Five identical cells each of internal resistance 1 $\Omega$ and emf 5 V are connected in series and in parallel with an external…MediumSingle correct
8 Jan 2020, Shift 2 · Q24The series combination of two batteries, both of the same emf $10\ \mathrm{V}$ , but different internal resistance of $20\ \Omega$ and…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.