JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 18 March 2021, Shift 2, Physics Q22

Question 22 of 90 in this shift, Physics question 22 of 30, Section B.

An infinite number of point charges, each carrying 1

\mu

C charge, are placed along the

y

-axis at

y=1

m, 2 m, 4 m, 8 m ................. . The total force on a 1 C point charge, placed at the origin, is

x\times10^3

N. The value of

x

, to the nearest integer, is _________. [Take

\frac{1}{4\pi\epsilon_0}=9\times10^9

^2

^2

]

Official answer

NTA final key.

Chapter: Electric Charges and Fields
Topic: Coulomb's Law
Idea tested: Superposition of Forces

Same idea in other shifts

Asked 5× in all

13 Apr 2023, Shift 2 · Q55Three point charges q, $-2q$ and $2q$ are placed on x-axis at a distance $x=0$ , $x=\frac{3}{4}R$ and $x=R$ respectively from origin as…MediumNumerical valueHas a figure
26 Jul 2022, Shift 2 · Q57Three point charges of magnitude $5\mu C$ , $0.16\mu C$ and $0.3\mu C$ are located at the vertices $A$ , $B$ , $C$ of a right angled triangle…MediumNumerical value
27 Jun 2022, Shift 2 · Q42Three identical charged balls each of charge 2 C are suspended from a common point P by silk threads of 2 m each (as shown in figure).…EasySingle correctHas a figure
29 Jun 2022, Shift 2 · Q33Two point charges $Q$ each are placed at a distance $d$ apart. A third point charge $q$ is placed at a distance $x$ from mid-point on the…MediumSingle correct

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.