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A voltmeter has a resistance G and range...

A voltmeter has a resistance `G` and range `V`. Calculate the resistance to be used in series with it to extend its range to `nV`.

A

`n G`

B

`( n - 1) G`

C

`(n + 1) G`

D

`G`

Text Solution

Verified by Experts

The correct Answer is:
B
`V = i_g G rArr i_g = V//G`
`nV = i_g (G + R)`
`nV = (V)/(G) (G + R)`
`R = (n-1) G`.
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