Question

To reduce the range of voltmeter, its resistance need to be reduced. A voltmeter has resistance $R_0$ and range V. Which of the following resistances when connected in parallel will convert it into a voltmeter of range $V/n$?

• A. $n{R}_0$
• B. $(n+1)R_0$
• C. $(n-1)R$
• D. None of these

Answer 1

Answer: (D)

None of these

When a resistance is connected in parallel, it reduces the resistance of combination but the range is not reduced. For the purpose of reducing the range the resistance in series with the galvanometer need to be reduced.
This cannot be achieved by connecting a resistance in parallel with voltmeter. It should be noted that the range of voltmeter can only be increased but cannot be decreased.