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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 25 February 2021, Shift 2, Physics Q29

Question 29 of 90 in this shift, Physics question 29 of 30, Section B.

A current of 6 A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2 Ω2\ \Omega each and leaves by the corner R. The currents i1i_1 in ampere is ____________ .

The figure, in words

Equilateral triangle PQR with P at the top, Q at bottom left, R at bottom right. A 6 A current arrow points down into P through a 2 Ω resistor above P. Each side of the triangle (PQ, PR, QR) contains a 2 Ω resistor. Current i1 is marked by an arrow along PQ and i2 by an arrow along PR, both pointing away from P. An arrow extends to the right from R.

Official answer

2

NTA final key.

Chapter
Current Electricity
Topic
Kirchhoff's Laws
Idea tested
Current Division Rule

Same idea in other shifts

Asked 3× in all
  1. 3 Apr 2025, Shift 1 · Q49In the figure shown below, a resistance of 150.4 Ω150.4\ \Omega is connected in series to an ammeter A of resistance 240 Ω240\ \Omega. A shunt…EasyNumerical valueHas a figure
  2. 27 Jun 2022, Shift 1 · Q36A 72 Ω72\ \Omega galvanometer is shunted by a resistance of 8 Ω8\ \Omega. The percentage of the total current which passes through the…EasySingle 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.