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Saturday, 31 October

JEE Main 2023 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 6 April 2023, Shift 1, Physics Q57

Question 57 of 90 in this shift, Physics question 27 of 30, Section B.

Two identical circular wires of radius 20 cm and carrying current 2\sqrt2 A are placed in perpendicular planes as shown in figure. The net magnetic field at the centre of the circular wires is ____________ ×10−8\times10^{-8} T. (Take π=3.14\pi=3.14)

The figure, in words

Two identical concentric circular loops in mutually perpendicular planes (one in the XY-plane drawn as a flat ellipse along X, the other in the plane containing the Y axis), each carrying current I; the common centre is at the origin; axes X and Y marked.

Official answer

628

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Biot-Savart Law
Idea tested
Superposition of magnetic fields

Same idea in other shifts

Asked 5× in all
  1. 2 Apr 2026, Shift 1 · Q39Two identical long current carrying wires are bent into the shapes shown in the following figures. If the magnitude of magnetic fields at…MediumSingle correctHas a figure
  2. 6 Apr 2026, Shift 2 · Q38A current of 30 A each flows in opposite directions in two conducting wires, placed parallel to each other at a distance of 8 cm. The…EasySingle correct
  3. 27 Jun 2022, Shift 2 · Q43Two long parallel conductors S1_1 and S2_2 are separated by a distance 10 cm and carrying currents of 4A and 2A respectively. The…HardSingle correctHas a figure
  4. 8 Jan 2020, Shift 2 · Q12A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a…HardDiagram 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. 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.