JEE Main 2020 — Current Electricity Question with Solution
From: JEE Main 2020 (Online) 9th January Evening Slot
Question
In a meter bridge experiment S is a standard
resistance. R is a resistance wire. It is found
that balancing length is = 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 (in cm) will now
be________.
This question includes a diagram. The text above accompanies the figure.
Enter your answer
Show full solutionCorrect answer: 40
Correct answer
40
Step-by-step explanation
= 3
R = =
R' = = 2R
Then
= =
= 40 cm
R = =
R' = = 2R
Then
= =
= 40 cm
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This is a previous-year question from JEE Main 2020, covering the Current Electricity chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.