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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceDiagram basedMediumMulti-step

JEE Main 29 July 2022, Shift 2, Physics Q36

Question 36 of 90 in this shift, Physics question 6 of 30, Section A.

A wire X of length 50 cm carrying a current of 2 A is placed parallel to a long wire Y of length 5 m. The wire Y carries a current of 3 A. The distance between two wires is 5 cm and currents flow in the same direction. The force acting on the wire Y is

The figure, in words

Two vertical parallel wires: short wire X carrying 2 A upward, long wire Y carrying 3 A upward, separated by 5 cm.
  1. (1)1.2×10−51.2\times10^{-5} N directed towards wire X.Official answer
  2. (2)1.2×10−41.2\times10^{-4} N directed away from wire X.
  3. (3)1.2×10−41.2\times10^{-4} N directed towards wire X.
  4. (4)2.4×10−52.4\times10^{-5} N directed towards wire X.

Official answer

Option 1

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Biot-Savart Law
Idea tested
Infinite and semi-infinite wires

Same idea in other shifts

Asked 4× in all
  1. 4 Apr 2024, Shift 2 · Q54Two parallel long current carrying wire separated by a distance 2r2r are shown in the figure. The ratio of magnetic field at AA to the…MediumNumerical valueHas a figure
  2. 27 Jan 2024, Shift 1 · Q57Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is 5.0 cm. The…EasyNumerical valueHas a figure
  3. 29 Jun 2022, Shift 2 · Q39Two long current carrying conductors are placed parallel to each other at a distance of 8 cm between them. The magnitude of magnetic field…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. 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.