Verified Solution • 2025–26 Session moderate

QJEEM20Ph5ca6: JEE Main 2020 Physics - Class 12 JEEM20Ph5ca6 Solution: A galvanometer having a coil resistance 100 gives a full scale…

A galvanometer having a coil resistance 100 Ω\Omega gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V?

Multiple Choice Options

  • A 8.9 k Ω\Omega
  • B 10 k Ω\Omega
  • C 9.9 k Ω\Omega
  • D 7.9 k Ω\Omega

Step-by-Step Verified Solution

ig = 1 mA , Rg = 100 Ω\Omega

V = ig(R + Rg)

⇒\Rightarrow 10 = 1 × 10–3 (R + 100)

⇒\Rightarrow R = 9.9 k Ω\Omega

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