JEE Main 2016 — Current Electricity Question with Solution
From: JEE Main 2016 (Online) 9th April Morning Slot
Question
A 50 resistance is connected to a battery of 5 V. A galvanometer of resistance 100 is to be used as an ammeter to measure current through the resistance, for this a resistance rs is connected to the galvanometer. Which of the following connections should be employed if the measured current is within 1% of thecurrent without the ammeter in the circuit ?
Choose an option
Show full solutionCorrect option: A
Correct answer
Ars = 0.5 in parallel with the galvanometer
Step-by-step explanation
Current in the circuit without ammeter
I A
With ammeter current 0.1 = 0.099 A
With ammeter equivalent resistance,
Req = 50 +
0.099 =
50 + =
100 rs = 50 + 0.5rs
99.5 rs = 50
rs
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This is a previous-year question from JEE Main 2016, 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.