1. Tardigrade
  2. Question
  3. Physics
  4. A galvanometer of resistance G is converted into a voltmeter of range 0-1 V by connecting a resistance R 1 in series with it. The additional resistance that should be connected in series with R 1 to increase the range of the voltmeter to -2 V will be :

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A galvanometer of resistance $G$ is converted into a voltmeter of range $0-1 V$ by connecting a resistance $R _{1}$ in series with it. The additional resistance that should be connected in series with $R _{1}$ to increase the range of the voltmeter to $-2 V$ will be :

JEE MainJEE Main 2020Moving Charges and Magnetism

Solution:

image
$\Rightarrow 2= i _{ g }\left( R _{1}+ R _{2}+ G \right) \ldots(2)$
(1) $\% (2)$
$\Rightarrow \frac{1}{2}=\frac{G+R_{1}}{G+R_{1}+R_{2}}$
$G + R _{1}+ R _{2}=2 G +2 h _{1}$
$\left(R_{2}=G+R_{1}\right)$