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Saturday, 31 October

JEE Main 2023 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 13 April 2023, Shift 2, Physics Q55

Question 55 of 90 in this shift, Physics question 25 of 30, Section B.

Three point charges q, −2q-2q and 2q2q are placed on x-axis at a distance x=0x=0, x=34Rx=\frac{3}{4}R and x=Rx=R respectively from origin as shown. If q=2×10−6q=2\times10^{-6} C and R=2R=2 cm, the magnitude of net force experienced by the charge −2q-2q is ______ N.

The figure, in words

Charges on the x-axis: q at x=0 (origin), -2q at distance 3R/4 from origin, 2q at distance R from origin.

Official answer

5440

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
  1. 26 Jul 2022, Shift 2 · Q57Three point charges of magnitude 5μC5\mu C, 0.16μC0.16\mu C and 0.3μC0.3\mu C are located at the vertices AA, BB, CC of a right angled triangle…MediumNumerical value
  2. 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
  3. 29 Jun 2022, Shift 2 · Q33Two point charges QQ each are placed at a distance dd apart. A third point charge qq is placed at a distance xx from mid-point on the…MediumSingle correct
  4. 18 Mar 2021, Shift 2 · Q22An infinite number of point charges, each carrying 1 μ\muC charge, are placed along the yy-axis at y=1y=1 m, 2 m, 4 m, 8 m…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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.