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A galvanometer of resistance R ohm when ...

A galvanometer of resistance R ohm when used as a voltmeter can read V volts (maximum) A multiplier is connected in series with the Galvanometer so that it is made a voltmeter that can read (NV) volts, (N>1). The value of the multiplier resistance `(R_m)` in ohms is

A

NR

B

(N-1)R

C

`R/(N-1)`

D

`(N-I)/R`

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