JEE Main 2018 — Current Electricity Question with Solution
From: JEE Main 2018 (Online) 16th April Morning Slot
Question
A galvanometer with its coil resistance 25 requires a current of 1 mA for its full deflection. In order to construct an ammeter to read upto a current of 2 A, the approximate value of the shunt resistance should be :
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Given,
Ig = 1 ma
I Ig = 2 A
Rg = 25
Ig Rg = (I Ig) S
S =
S = 1.25 102
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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.