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To decrease the range of an ammeter its ...

To decrease the range of an ammeter its resistance need to be increased. An ammeter has resistance `R_0` and range `I`. Which of the following resistance can be connected in series with it to decrease its range to `I/n`.

A

`R_0/n`

B

`R_0/((n-1))`

C

`R_0/((n+1))`

D

none of the above.

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