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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumConceptual

JEE Main 27 July 2022, Shift 2, Physics Q52

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

In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is 40 cm. The balancing length, if the radius of the wire AB is doubled, will be ___________ cm.

The figure, in words

Meter bridge: 5 V battery across ends A and B of the wire; R1 and R2 in series in the upper arm, galvanometer G connected from the junction of R1 and R2 to jockey C on wire AB.

Official answer

40

NTA final key.

Chapter
Current Electricity
Topic
Wheatstone Bridge
Idea tested
Meter Bridge Principles

Same idea in other shifts

Asked 7× in all
  1. 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
  2. 31 Jan 2024, Shift 2 · Q49The resistance per centimeter of a meter bridge wire is rr, with X ΩX\ \Omega resistance in left gap. Balancing length from left end is at…MediumSingle correct
  3. 26 Jul 2022, Shift 1 · Q56Resistances are connected in a meter bridge circuit as shown in the figure. The balancing length l1l_1 is 40 cm. Now an unknown resistance…MediumNumerical valueHas a figure
  4. 27 Jul 2022, Shift 1 · Q51In a meter bridge experiment, for measuring unknown resistance 'S', the null point is obtained at a distance 30 cm from the left side as…EasyNumerical valueHas a figure
  5. 18 Mar 2021, Shift 2 · Q26Consider a 72 cm long wire AB as shown in the figure. The galvanometer jockey is placed at P on AB at a distance xx cm from A. The…EasyNumerical valueHas a figure
  6. 9 Jan 2020, Shift 2 · Q23In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is l=25l = 25 cm. If R is…EasyNumerical valueHas 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.