JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 22 July 2021, Shift 2, Physics Q27

Question 27 of 90 in this shift, Physics question 27 of 30, Section B.

In an electric circuit, a cell of certain emf provides a potential difference of 1.25 V across a load resistance of 5

\Omega

. However, it provides a potential difference of 1 V across a load resistance of 2

\Omega

. The emf of the cell is given by

\frac{x}{10}

V. Then the value of

x

is ________.

Official answer

NTA final key.

Chapter: Current Electricity
Topic: Kirchhoff's Laws
Idea tested: Cell EMF and Internal Resistance

Same idea in other shifts

Asked 10× in all

5 Apr 2026, Shift 2 · Q49When an external resistance of 5 $\Omega$ is connected across terminals of a cell, a current of 0.25 A flows through it. When the 5…EasyNumerical value
8 Apr 2024, Shift 1 · Q40In the given circuit, the terminal potential difference of the cell is :EasySingle correctHas a figure
31 Jan 2024, Shift 2 · Q56In the following circuit, the battery has an emf of 2V and an internal resistance of $\frac{2}{3}\Omega$ . The power consumption in the…MediumNumerical valueHas a figure
11 Apr 2023, Shift 2 · Q59Two identical cells each of emf $1.5\ \mathrm{V}$ are connected in series across a $10\ \Omega$ resistance. An ideal voltmeter connected…MediumNumerical value
27 Jul 2022, Shift 1 · Q41Two sources of equal emfs are connected in series. This combination is connected to an external resistance R. The internal resistances of…MediumSingle correct
30 Jul 2022, Shift 2 · Q24A cell sends a current through a resistance 4 Ω for time t and sends current through another resistance 16 Ω for the same time t.If the…MediumNumerical value
27 Aug 2021, Shift 1 · Q26First, a set of n equal resistors of 10 $\Omega$ each are connected in series to a battery of emf 20 V and internal resistance 10…MediumNumerical value
17 Mar 2021, Shift 2 · Q2Two cells of emf 2E and E with internal resistance $\mathrm{r_1}$ and $\mathrm{r_2}$ respectively are connected in series to an external…MediumDiagram basedHas a figure

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.