JEE Main 2019 — Experimental Physics Question with Solution
JEE Main 2019 (11 Jan Shift 1)
Question
The resistance of the meter bridge AB in given figure is . With a cell of emf and rheostat resistance the null point is obtained at some point J. When the cell is replaced by another one of emf the same null point is found for . The is:
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Given, Emf of cell, Rheostat resistance, Potential gradient is
Let null point be at when cell of is used.
thus ...(i)
For resistance new potential gradient is and at null point
...(ii)
Dividing equation (i) by (ii) we get
thus
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This is a previous-year question from JEE Main 2019, covering the Experimental Physics 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.