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Friday, 9 October

JEE Main 2020 · PhysicsNumerical answerNumerical valueEasyMulti-step

JEE Main 9 January 2020, Shift 2, Physics Q23

Question 23 of 75 in this shift, Physics question 23 of 25, Section B.

In 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 replaced by a wire of half length and half diameter that of R of same material, then the balancing distance l′l' (in cm) will now be ______.

The figure, in words

Meter bridge: resistance wire R in the left gap and standard resistance S in the right gap, galvanometer G with jockey, balancing length l measured from the left end, battery V connected across the bridge wire.

Official answer

40.00

NTA final key (Jan 2020).

Chapter
Current Electricity
Topic
Wheatstone Bridge
Idea tested
Meter Bridge Principles

Same idea in other shifts

Asked 2× in all
  1. 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

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 42 of the 174 JEE Main shifts held from 2017 to 2026.