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A voltmeter has a range O - V with a ser...

A voltmeter has a range `O - V` with a series resistance `R`. With a series resistance `2R`, the range is `O - V`. The correct relation between `V` and `V'`is

A

`V'lt2V`

B

`V'gt2V`

C

`V'=2V`

D

`V'=V`

Text Solution

Verified by Experts

The correct Answer is:
A
`I_g=(V)/(R+G)=(V)/(2R+G)`
`therefore(V)/(V)=(2R+G)/(R+G)=(2(R+G)-G)/(R+G)`
`=2-(G)/(R+a)lt 2`
`rArr V'lt 2V` .
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