Question

A galvanometer of 25 $\Omega$ resistance can read a maximum current of 6 mA. It can be used as a voltmeter to measure maximum 6V by connecting a resistance to galvanometer. Identify the correct choice in the given answers :

• A. 1025 $\Omega$ in series
• B. 1025 $\Omega$ in parallel
• C. 975 $\Omega$ in series
• D. 975 $\Omega$ in parallel

Answer 1

Answer: (C)

975 $\Omega$ in series

$\frac{6}{25+R}=6\times {10}^{-3}$

$1000=25+R$

$R=975\Omega$