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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 28 June 2022, Shift 1, Physics Q52

Question 52 of 90 in this shift, Physics question 22 of 30, Section B.

A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 Ω\Omega. The galvanometer (G) shows null deflection when tapping key is at 43 cm mark from end A. If the end correction for end A is 2 cm, then the determined value of R will be ____________ Ω\Omega.

The figure, in words

A meter bridge: a wire from end A to end B with a 5 V cell and key K connected across A and B; a galvanometer G connected to a jockey touching the wire; two gaps below the wire with a 15 Ω\Omega resistor in the left gap and the unknown resistor R in the right gap.

Official answer

19

NTA final key.

Chapter
Current Electricity
Topic
Wheatstone Bridge
Idea tested
Meter Bridge End Corrections

Same topic in other shifts

All Wheatstone Bridge questions
  1. 6 Apr 2026, Shift 2 · Q48A moving coil of galvanometer when shunted with 2 Ω\Omega resistance gives a full scale deflection for a current of 500 mA. When a…MediumNumerical value
  2. 7 Apr 2025, Shift 1 · Q36A wire of resistance R is bent into a triangular pyramid as shown in figure with each segment having same length. The resistance between…MediumDiagram basedHas a figure
  3. 5 Apr 2024, Shift 2 · Q46A galvanometer of resistance 100 Ω100\ \Omega when connected in series with 400 Ω400\ \Omega measures a voltage of upto 10 V. The value of…MediumSingle correct
  4. 6 Apr 2024, Shift 1 · Q40The value of unknown resistance (xx) for which the potential difference between BB and DD will be zero in the arrangement shown, is :MediumSingle correctHas a figure
  5. 9 Apr 2024, Shift 1 · Q50A galvanometer has a coil of resistance 200 Ω200\ \Omega with a full scale deflection at 20 μ20\ \muA. The value of resistance to be added to…EasySingle correct
  6. 1 Feb 2024, Shift 2 · Q50In a metre-bridge when a resistance in the left gap is 2 Ω2\,\Omega and unknown resistance in the right gap, the balance length is found to…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.