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A voltmeter has resistance R0 and range ...

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`

Text Solution

Verified by Experts

The correct Answer is:
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.
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