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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumMulti-step

JEE Main 4 September 2020, Shift 2, Physics Q20

Question 20 of 75 in this shift, Physics question 20 of 25.

The value of current i1i_1 flowing from A to C in the circuit diagram is :

The figure, in words

A rectangular outer loop with a battery marked 8 V in the top wire; the left side has an arrow marked i pointing down and the right side an arrow marked i pointing up. Left and right sides come down to nodes A (left) and C (right) on a horizontal wire. Four-sided diamond with nodes B (top), C (right), D (bottom), A (left): resistors 2 ohm on each of the four sides AB, BC, AD, DC. A vertical line from B to D contains a 5 ohm resistor between B and the horizontal line and a 5 ohm resistor between the horizontal line and D. The horizontal line from A to C has a 4 ohm resistor on the left half (with arrow i_1 pointing right towards the centre) and a 4 ohm resistor on the right half; at the centre the horizontal wire crosses the vertical B-D line with a small semicircular hump (no junction dot drawn).
  1. (1)1 AOfficial answer
  2. (2)2 A
  3. (3)4 A
  4. (4)5 A

Official answer

Option 1

NTA final key (Sep 2020).

Chapter
Current Electricity
Topic
Kirchhoff's Laws
Idea tested
Identifying False Junctions

Same idea in other shifts

Asked 2× in all
  1. 9 Apr 2024, Shift 1 · Q41The equivalent resistance between A and B is :MediumSingle correctHas 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.