Verified Solution • 2025–26 Session moderate

QJEEM17Pha07b: JEE Main 2017 Physics - Class 12 JEEM17Pha07b Solution: When a current of 5 mA is passed through a galvanometer having…

When a current of 5 mA is passed through a galvanometer having a coil of resistance 15Ω, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0 – 10V is:

Multiple Choice Options

  • A 4.005 × 103 Ω
  • B 1.985 × 103 Ω
  • C 2.535 × 103 Ω
  • D 2.045 × 103 Ω

Step-by-Step Verified Solution

Given : Current through the galvanometer,

ig = 5 × 10–3 A

Galvanometer resistance, G = 15 Ω

Let resistance R to be put in series with the galvanometer to convert it into a voltmeter.

V = ig (R + G)

10 = 5 × 10–3 (R + 15)

∴ R = 2000 – 15 = 1985

= 1.985 × 103 Ω

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring