JEE Main 2018 — Current Electricity Question with Solution
From: JEE Main 2018 (Offline)
Question
On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The
resistance of their series combination is 1 k. How much was the resistance on the left slot before
interchanging the resistances?
Choose an option
Show full solutionCorrect option: D
Correct answer
D550
Step-by-step explanation
= . . . . . (1)
When X and Y are interchanged.
=
= . . . . . (2)
From (1) and (2) we get,
=
2 10 = 11000 100 110 + 2
200 = 11000
= 55 cm
Putting this value of , in equation (1)
=
45X = 55000 55X
100X = 55000
X = 550
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This is a previous-year question from JEE Main 2018, 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.