A voltmeter has resistance `R_0` and range V. What resistance should be connected in series with it to increase its range to n V ?

Question

A voltmeter has resistance `R_0` and range V. What resistance should be connected in series with it to increase its range to n V ?

A voltmeter has resistance `R_0` and range V. What resistance should be connected in series with it to increase its range to n V ?
A. `nR_0`
B. `(n+1)R_0`
C. `(n-1)R_0`
D. `R_0//n`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - C
When a resistance is connected in parallel , it will only reduce the resistance of the combination , but will not reduce the range. For reducing the range , the resistance in series with the galvanometer need to be reduced. This can not be achieved by connecting a resistance in parallel with the galvanometer.